diff --git a/pysollib/kivy/LApp.py b/pysollib/kivy/LApp.py
index e3d3a3bec..152711e09 100644
--- a/pysollib/kivy/LApp.py
+++ b/pysollib/kivy/LApp.py
@@ -71,6 +71,15 @@ def get_platform():
 # =============================================================================
 
 
+def get_menu_size_hint():
+    sh = (0.5, 1.0)
+    if Window.size[0] < Window.size[1]:
+        sh = (1.0, 1.0)
+    return sh
+
+# =============================================================================
+
+
 def get_screen_ori():
     if get_platform() == 'android':
         from jnius import autoclass
@@ -1040,7 +1049,7 @@ class LTopLevelContent(BoxLayout, LBase):
     def __init__(self, **kw):
         super(LTopLevelContent, self).__init__(**kw)
 
-        # beispiel zu canvas (hintergrund)
+        # Macht die Hintergrundfarbe der TopLevel (Dialog-) Fenster.
         with self.canvas.before:
             Color(0.45, 0.5, 0.5, 1.0)
             self.rect = Rectangle(pos=self.pos, size=self.size)
@@ -1086,30 +1095,12 @@ def __init__(self, top, title=None, **kw):
         super(LTopLevel0, self).__init__(
             orientation="vertical", **kw)
 
-        # self.canvas.add(Color(0, 1, 0, 0.4))
-        # self.canvas.add(Rectangle(pos=(100, 100), size=(100, 100)))
-
-        self.size_hint = (0.5, 1.0)
-        '''
-        self.titleline = BoxLayout(
-            orientation="horizontal", size_hint=[1.0, 0.15], **kw)
-        self.button = Button(text="X", size_hint=[0.15, 1.0], **kw)
-        if not title:
-            title = '<>'
-        self.title = Label(text=title, **kw)
-        self.titleline.add_widget(self.title)
-        self.titleline.add_widget(self.button)
-        '''
-        self.titleline = LTopLine(text=title, size_hint=[1.0, 0.15])
         self.title = title
-
-        # self.content = BoxLayout(orientation="vertical", **kw)
+        self.titleline = LTopLine(text=title, size_hint=[1.0, 0.15])
         self.content = LTopLevelContent(orientation="vertical", **kw)
         self.add_widget(self.titleline)
         self.add_widget(self.content)
-        '''
-        self.button.bind(on_press=self.onClick)
-        '''
+
         self.titleline.bind(on_press=self.onClick)
         self.main.pushWork(self.title, self)
 
@@ -1126,12 +1117,7 @@ def __init__(self, parent, title=None, **kw):
         super(LTopLevel, self).__init__(
             orientation="vertical", **kw)
 
-        if ('size_hint' not in kw):
-            self.size_hint = (0.5, 1.0)
-        else:
-            del kw['size_hint']
         self.titleline = LTopLine(text=title, size_hint=(1.0, 0.10))
-
         self.content = LTopLevelContent(orientation="vertical", **kw)
         self.add_widget(self.titleline)
         self.add_widget(self.content)
@@ -1156,7 +1142,6 @@ def processAndroidBack(self):
                     pass
         return ret
 
-
 # =============================================================================
 
 
@@ -1782,23 +1767,6 @@ def key_input(self, window, key, scancode, codepoint, modifier):
         else:
             return False    # delegate
 
-    def delayedRebuild(self, dt):
-        logging.info("LApp: delayedRebuild")
-        self.mainWindow.rebuildContainer()
-
-    def makeDelayedRebuild(self):
-        def delayedRebuild(dt):
-            # Clock.schedule_once(self.delayedRebuild, 0.01)
-            Clock.schedule_once(self.delayedRebuild, 0.5)
-        return delayedRebuild
-
-    def doSize(self, obj, val):
-        mval = self.mainWindow.size
-        if (val[0] != mval[0] and val[1] != mval[1]):
-            logging.info("LApp: size changed %s - %s (%s)" % (obj, val, mval))
-            Clock.schedule_once(self.makeDelayedRebuild(), 0.2)
-        pass
-
     def __init__(self, args):
         super(LApp, self).__init__()
         self.args = args
@@ -1835,7 +1803,6 @@ def app_start(self, dt):
         Cache.append('LAppCache', 'mainApp', self, timeout=0)
         self.startCode = 0
         Window.bind(on_keyboard=self.key_input)
-        Window.bind(size=self.doSize)
 
         from pysollib.app import Application
         from pysollib.main import pysol_init
@@ -1962,6 +1929,17 @@ def on_resume(self):
         # wieder falsch aufstellt. (woher kommt die und warum ist sie
         # oft falsch ?)
 
+        # Gelegentlich beobachtet: Schwarzer Bilschirm nach resume. Und
+        # das bleibt dann so auf ewig. Aber die app läuft stabil. Die
+        # einzige Interaktion mit der App ist über die Android buttons
+        # für hintrgrund und resume. Diese funktioneren gemäss logcat
+        # einwandfrei. Daher versuchen wir ... um den graphik context
+        # wieder zu aktivieren/auszurichten:
+        Clock.schedule_once(lambda dt: Window.update_viewport(), 2.0)
+        # (Es gibt auch Beispiele in den kivy issues die nahelegen, dass
+        # das nützlich sein könnte)
+
+        # Pause modus abschalten nach resume:
         if app.game.pause:
             Clock.schedule_once(self.makeEndPauseCmd(app), 3.0)
 
diff --git a/pysollib/kivy/menubar.py b/pysollib/kivy/menubar.py
index 9fc54c6a7..6fed19715 100644
--- a/pysollib/kivy/menubar.py
+++ b/pysollib/kivy/menubar.py
@@ -207,6 +207,13 @@ def __init__(self, menubar, parent, title, app, **kw):
         self.window = window
         self.running = True
 
+        from pysollib.kivy.LApp import get_menu_size_hint
+
+        def updrule(obj, val):
+            self.window.size_hint = get_menu_size_hint()
+        updrule(0, 0)
+        self.parent.bind(size=updrule)
+
         if self.persist:
             self.dialogCache[title] = window
 
@@ -241,7 +248,6 @@ def buildTree(self, tree, node):
 class MainMenuDialog(LMenuDialog):
 
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.2, 1)
         kw['persist'] = True
         super(MainMenuDialog, self).__init__(
             menubar, parent, title, app, **kw)
@@ -289,7 +295,6 @@ def buildTree(self, tv, node):
 class FileMenuDialog(LMenuDialog):
 
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.3, 1)
         super(FileMenuDialog, self).__init__(
             menubar, parent, title, app, **kw)
 
@@ -358,7 +363,6 @@ def buildTree(self, tv, node):
 class EditMenuDialog(LMenuDialog):  # Tools
 
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.2, 1)
         kw['persist'] = True
         super(EditMenuDialog, self).__init__(
             menubar, parent, title, app, **kw)
@@ -431,7 +435,6 @@ def buildTree(self, tv, node):
 class GameMenuDialog(LMenuDialog):
 
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.2, 1)
         kw['persist'] = True
         super(GameMenuDialog, self).__init__(
             menubar, parent, title, app, **kw)
@@ -502,7 +505,6 @@ def buildTree(self, tv, node):
 class AssistMenuDialog(LMenuDialog):
 
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.2, 1)
         kw['persist'] = True
         super(AssistMenuDialog, self).__init__(
             menubar, parent, title, app, **kw)
@@ -1279,7 +1281,6 @@ def buildTree(self, tv, node):
 class OptionsMenuDialog(LMenuDialog):
 
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.5, 1)
         kw['persist'] = True
         super(OptionsMenuDialog, self).__init__(
             menubar, parent, title, app, **kw)
@@ -1295,7 +1296,6 @@ def initTree(self):
 
 class HelpMenuDialog(LMenuDialog):
     def __init__(self, menubar, parent, title, app, **kw):
-        kw['size_hint'] = (0.3, 1)
         kw['persist'] = True
         super(HelpMenuDialog, self).__init__(menubar, parent, title, app, **kw)
 
diff --git a/pysollib/kivy/selectgame.py b/pysollib/kivy/selectgame.py
index 82fcc0a4c..d28ce254b 100644
--- a/pysollib/kivy/selectgame.py
+++ b/pysollib/kivy/selectgame.py
@@ -28,6 +28,7 @@
 from pysollib.kivy.LApp import LTopLevel
 from pysollib.kivy.LApp import LTreeNode
 from pysollib.kivy.LApp import LTreeRoot
+from pysollib.kivy.LApp import get_menu_size_hint
 from pysollib.kivy.selecttree import SelectDialogTreeData
 from pysollib.kivy.selecttree import SelectDialogTreeLeaf, SelectDialogTreeNode
 from pysollib.mygettext import _
@@ -382,7 +383,6 @@ class SelectGameDialog(object):
     def onClick(self, event):
         print('LTopLevel: onClick')
         SelectGameDialog.SingleInstance.parent.popWork('SelectGame')
-        SelectGameDialog.SingleInstance.running = False
 
     def selectCmd(self, gameid):
         self.app.menubar._mSelectGame(gameid)
@@ -394,31 +394,31 @@ def __init__(self, parent, title, app, gameid, **kw):
         self.app = app
         self.gameid = gameid
         self.random = None
-        self.running = False
         self.window = None
 
         # bestehenden Dialog rezyklieren.
 
         si = SelectGameDialog.SingleInstance
-        # if (si and si.running): return
-        if (si and si.running):
-            si.parent.popWork('SelectGame')
-            si.running = False
+        if si and si.parent.workStack.peek('SelectGame') is not None:
+            parent.popWork('SelectGame')
             return
         if (si):
             si.parent.pushWork('SelectGame', si.window)
-            si.running = True
             return
 
         # neuen Dialog aufbauen.
 
-        window = LTopLevel(parent, title)
-        window.titleline.bind(on_press=self.onClick)
-        self.parent.pushWork('SelectGame', window)
-        self.window = window
-        self.running = True
+        self.window = window = LTopLevel(parent, title)
+        self.window.titleline.bind(on_press=self.onClick)
+
+        self.parent.pushWork('SelectGame', self.window)
         SelectGameDialog.SingleInstance = self
 
+        def updrule(obj, val):
+            self.window.size_hint = get_menu_size_hint()
+        updrule(0, 0)
+        self.parent.bind(size=updrule)
+
         # Asynchron laden.
 
         def loaderCB(treeview, node):
@@ -477,7 +477,7 @@ def loaderCB(treeview, node):
             tree,
             self.app.canvas,
             root_options=dict(text='Tree One'))
-        tv.size_hint = 1, None
+        tv.size_hint = (1, None)
         tv.hide_root = True
         tv.load_func = loaderCB
         tv.bind(minimum_height=tv.setter('height'))
diff --git a/pysollib/kivy/tkcanvas.py b/pysollib/kivy/tkcanvas.py
index da6cb073e..927fab0bc 100644
--- a/pysollib/kivy/tkcanvas.py
+++ b/pysollib/kivy/tkcanvas.py
@@ -692,7 +692,7 @@ def update_widget(self, posorobj, size):
         def psize(s):
             return "({:1.2f}, {:1.2f})".format(s[0], s[1])
 
-        logging.info('MfxCanvas: update_widget to: '+psize(size))
+        # logging.info('MfxCanvas: update_widget to: '+psize(size))
 
         # print('MfxCanvas: update_widget size=(%s, %s)' %
         #       (self.size[0], self.size[1]))
@@ -701,7 +701,7 @@ def psize(s):
 
         # oldscale = self.scale
         newscale = self.scalefactor()
-        logging.info('MfxCanvas: scale factor: {:1.2f})'.format(newscale))
+        # logging.info('MfxCanvas: scale factor: {:1.2f})'.format(newscale))
         self.scale = newscale
 
         # Anpassung Skalierung.
@@ -848,8 +848,8 @@ def setTextColor(self, color):
         else:
             lumi = LColorToLuminance(self._bg_color)
 
-        self._text_color = ("#000000", "#ffffff")[lumi < 0.5]
-        print('average luminance =', lumi)
+        self._text_color = ("#000000", "#ffffff")[lumi < 0.4]
+        # print('average luminance =', lumi)
 
     def setTile(self, image, stretch=0, save_aspect=0):
 
diff --git a/pysollib/kivy/tkstats.py b/pysollib/kivy/tkstats.py
index 02aeac23f..04095f6bd 100644
--- a/pysollib/kivy/tkstats.py
+++ b/pysollib/kivy/tkstats.py
@@ -128,9 +128,9 @@ def updateCanvas(self, instance, value):
 # *
 # ************************************************************************
 
+
 class SingleGame_StatsDialog(MfxDialog):
     def __init__(self, parent, title, app, player, gameid, **kw):
-        kw['size_hint'] = (0.5, 1)
         self.app = app
         self.selected_game = None
         kw = self.initKw(kw)
@@ -142,8 +142,6 @@ def __init__(self, parent, title, app, player, gameid, **kw):
         MfxDialog.__init__(self, parent, title, kw.resizable, kw.default)
         top_frame, bottom_frame = self.createFrames(kw)
         self.top_frame = top_frame
-
-#        self.createBitmaps(top_frame, kw)
         #
         self.player = player or _("Demo games")
         self.top.wm_minsize(200, 200)
diff --git a/pysollib/kivy/tkutil.py b/pysollib/kivy/tkutil.py
index e22bec053..5cfcc7d8d 100644
--- a/pysollib/kivy/tkutil.py
+++ b/pysollib/kivy/tkutil.py
@@ -68,6 +68,9 @@ def setTransient(window, parent, relx=None, rely=None, expose=1):
     return
 
 
+# ANM: werden ev. immer noch vom pysollib core benötigt/referenziert:
+# (intern in kivy bitte nicht direkt benutzen).
+
 def makeToplevel(parent, title=None):
     print('tkutil: makeTopLevel')
 
diff --git a/pysollib/kivy/tkwidget.py b/pysollib/kivy/tkwidget.py
index ba251beee..be1184930 100644
--- a/pysollib/kivy/tkwidget.py
+++ b/pysollib/kivy/tkwidget.py
@@ -39,10 +39,11 @@
 from pysollib.kivy.LApp import LBoxLayout
 from pysollib.kivy.LApp import LScrollView
 from pysollib.kivy.LApp import LTopLevel
+from pysollib.kivy.LApp import LTopLevel0
+from pysollib.kivy.LApp import get_menu_size_hint
 from pysollib.kivy.LImage import LImage
 from pysollib.kivy.tkcanvas import MfxCanvas
 from pysollib.kivy.tkutil import bind, unbind_destroy
-from pysollib.kivy.tkutil import makeToplevel
 from pysollib.mfxutil import KwStruct, kwdefault
 from pysollib.mygettext import _
 from pysollib.settings import WIN_SYSTEM
@@ -63,7 +64,13 @@ def __init__(self, parent, title="", resizable=False, default=-1):
         self.timer = None
         self.buttons = []
         self.accel_keys = {}
-        self.top = makeToplevel(parent, title=title)
+        self.window = LTopLevel0(parent, title=title)
+        self.top = self.window.content
+
+        def setSizeRule(obj, val):
+            self.window.size_hint = get_menu_size_hint()
+        self.parent.bind(size=setSizeRule)
+        setSizeRule(0, 0)
 
     def wmDeleteWindow(self, *event):
         self.status = 1