diff --git a/bulker/_version.py b/bulker/_version.py
index a5f830a..bc8c296 100644
--- a/bulker/_version.py
+++ b/bulker/_version.py
@@ -1 +1 @@
-__version__ = "0.7.1"
+__version__ = "0.7.2"
diff --git a/bulker/bulker.py b/bulker/bulker.py
index ef0b532..9e548f2 100644
--- a/bulker/bulker.py
+++ b/bulker/bulker.py
@@ -443,7 +443,7 @@ def bulker_load(manifest, cratevars, bcfg, exe_jinja2_template,
                                   manifest_name,
                                   cratevars['tag'])
     if not os.path.isabs(crate_path):
-        crate_path = os.path.join(os.path.dirname(bcfg._file_path), crate_path)
+        crate_path = os.path.join(os.path.dirname(bcfg["__internal"].file_path), crate_path)
 
     _LOGGER.debug("Crate path: {}".format(crate_path))
     _LOGGER.debug("cratevars: {}".format(cratevars))
@@ -483,7 +483,7 @@ def bulker_load(manifest, cratevars, bcfg, exe_jinja2_template,
                               imp_cratevars['crate'],
                               imp_cratevars['tag'])
         if not os.path.isabs(imp_crate_path):
-            imp_crate_path = os.path.join(os.path.dirname(bcfg._file_path), imp_crate_path)            
+            imp_crate_path = os.path.join(os.path.dirname(bcfg["__internal"].file_path), imp_crate_path)            
         if not os.path.exists(imp_crate_path):
             _LOGGER.error("Nonexistent crate: '{}' from '{}'. Reloading...".format(imp, imp_crate_path))
             reload_import = True
@@ -533,7 +533,7 @@ def host_tool_specific_args(bcfg, pkg, hosttool_arg_key):
                 if os.path.isabs(pkg["singularity_image_folder"]):
                     sif = pkg["singularity_image_folder"]
                 else:
-                    sif = os.path.join(os.path.dirname(bcfg._file_path),
+                    sif = os.path.join(os.path.dirname(bcfg["__internal"].file_path),
                                        pkg["singularity_image_folder"])
 
                 pkg["singularity_fullpath"] = os.path.join(
@@ -756,10 +756,10 @@ def bulker_activate(bulker_config, cratelist, echo=False, strict=False, prompt=T
         if os.path.basename(shellpath) == "bash":    
             if strict:
                 rcfile = mkabs(bulker_config.bulker.rcfile_strict,
-                                 os.path.dirname(bulker_config._file_path))
+                                 os.path.dirname(bulker_config["__internal"].file_path))
             else:
                 rcfile = mkabs(bulker_config.bulker.rcfile,
-                             os.path.dirname(bulker_config._file_path))
+                             os.path.dirname(bulker_config["__internal"].file_path))
 
             shell_list.append("--rcfile")
             shell_list.append(rcfile)
@@ -770,11 +770,11 @@ def bulker_activate(bulker_config, cratelist, echo=False, strict=False, prompt=T
             if strict:
                 rcfolder = mkabs(os.path.join(
                     os.path.dirname(bulker_config.bulker.rcfile_strict),
-                    "zsh_start_strict"), os.path.dirname(bulker_config._file_path))     
+                    "zsh_start_strict"), os.path.dirname(bulker_config["__internal"].file_path))     
             else:
                 rcfolder = mkabs(os.path.join(
                     os.path.dirname(bulker_config.bulker.rcfile_strict),
-                    "zsh_start"), os.path.dirname(bulker_config._file_path))   
+                    "zsh_start"), os.path.dirname(bulker_config["__internal"].file_path))   
 
             new_env["ZDOTDIR"] = rcfolder
             _LOGGER.debug("ZDOTDIR: {}".format(new_env["ZDOTDIR"]))
@@ -844,6 +844,7 @@ def maybe_quote(item):
     global PROC
     PROC = psutil.Popen(merged_command, shell=True, preexec_fn=os.setsid)
     PROC.communicate()
+    sys.exit(PROC.returncode)
     #command[0:0] = ["export", "PATH=\"{}\"".format(newpath)]
     #subprocess.call(merged_command)
 
@@ -1047,12 +1048,12 @@ def prep_load(bulker_config, crate_registry_paths, manifest=None, build=False):
     shell_template_jinja = None
 
     exe_template = mkabs(bulker_config.bulker.executable_template,
-                         os.path.dirname(bulker_config._file_path))
+                         os.path.dirname(bulker_config["__internal"].file_path))
     build_template = mkabs(bulker_config.bulker.build_template, 
-                           os.path.dirname(bulker_config._file_path))
+                           os.path.dirname(bulker_config["__internal"].file_path))
     try:
         shell_template = mkabs(bulker_config.bulker.shell_template,
-                         os.path.dirname(bulker_config._file_path))        
+                         os.path.dirname(bulker_config["__internal"].file_path))        
     except AttributeError:
         _LOGGER.error("You need to re-initialize your bulker config or add a 'shell_template' attribute.")
         sys.exit(1)
@@ -1289,7 +1290,7 @@ def main():
                                   manifest_name,
                                   cratevars['tag'])
         if not os.path.isabs(crate_path):
-            crate_path = os.path.join(os.path.dirname(bcfg._file_path), crate_path)
+            crate_path = os.path.join(os.path.dirname(bulker_config["__internal"].file_path), crate_path)
         print("Crate path: {}".format(crate_path))
 
         
@@ -1359,13 +1360,18 @@ def main():
         manifest, cratevars, exe_template_jinja, shell_template_jinja, build_template_jinja = prep_load(
             bulker_config, args.crate_registry_paths, args.manifest, args.build)
 
-        bulker_load(manifest, cratevars, bulker_config, 
+        try:
+            bulker_load(manifest, cratevars, bulker_config, 
                     exe_jinja2_template=exe_template_jinja, 
                     shell_jinja2_template=shell_template_jinja, 
                     crate_path=args.path,
                     build=build_template_jinja,
                     force=args.force,
                     recurse=args.recurse)
+        except Exception as e:
+            print(f'Bulker load failed: {e}')
+            sys.exit(1)
+
 
     if args.command == "reload":
         bulker_config.make_writable()
diff --git a/bulker/templates/start.sh b/bulker/templates/start.sh
index 986f2fa..de36c6f 100755
--- a/bulker/templates/start.sh
+++ b/bulker/templates/start.sh
@@ -1,4 +1,3 @@
 source "${BULKERSHELLRC}"
-echo $BULKERPROMPT
 if [ -z ${BULKERPROMPT+x} ]; then echo "No prompt change"; else PS1="${BULKERPROMPT}"; fi
 export PATH="${BULKERPATH}:${PATH}"
diff --git a/docs/changelog.md b/docs/changelog.md
index 12024d2..cf942d2 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,7 +1,12 @@
 # Changelog
 
+## [0.7.2] -- 2021-06-24
+- Update to yacman 0.8.0, fixing references to internal config attributes.
+- Add documentation and clarity for the `shell_prompt` option
+- Fixed bug with relative crate root folders.
+
 ## [0.7.1] -- 2021-03-03
--- Fixed bug in bulker reload.
+- Fixed bug in bulker reload.
 
 ## [0.7.0] -- 2021-03-02
 - EXPERIMENTAL: Added `bulker cwl2man` to create a bulker manifest from a CWL file.
diff --git a/docs/custom_prompts.md b/docs/custom_prompts.md
new file mode 100644
index 0000000..e59918c
--- /dev/null
+++ b/docs/custom_prompts.md
@@ -0,0 +1,71 @@
+# Customizing bulker prompts
+
+By default, when you activate a crate, bulker will change your prompt. You can customize it by specifying the `shell_prompt` attribute in your bulker config. *Make sure you enclose the value in single quotes*; if you use double-quotes the parser will re-escape your prompt escape sequences and break stuff. Here are some examples:
+
+In these examples we'll activate the crate like this:
+
+```console
+bulker activate databio/lab
+```
+
+The variables that could be displayed are these:
+
+- namespace: `databio`
+- crate name: `lab`
+- username: `nsheff`
+- host: `zither`
+- working directory: `code`
+
+# Default prompt
+
+The default bulker prompt shows you the name of the crate you've activated, colored in yellow. Bulker uses `\b` to indicate the name of the bulker namespace and crate. The default prompt is the equivalent of putting this in your config:
+
+```yaml
+  shell_prompt: '\[\033[01;93m\]\b|\[\033[00m\]\[\033[01;34m\]\w\[\033[00m\]\$ '
+```
+
+![](img/prompts/default.png)
+
+
+## Include username and hostname
+
+In addition the bulker-provided `\b`, there are lots of other shell-provided variables you can use, like `\u` for username and `\h` for hostname, and `\W` for working directory path. You can look up lists of these by searching for *customizing bash PS1 prompt*. Here's a simple sample using *username* and *hostname*:
+
+```yaml
+  shell_prompt: '[\u@\h(\b) \W] $ '
+```
+
+![](img/prompts/prompt1.png)
+
+## Change colors
+
+You can al;so use any terminal colors compatible with your terminal. 
+
+
+```yaml
+  shell_prompt: '\u@\h|\e[94m\b\[\e[00m\]:\e[90m\W\e[39m $ '
+```
+
+![](img/prompts/prompt2.png)
+
+
+## Emoji
+
+Yes, you can even put emoji in your prompt, if that's your thing:
+
+```yaml
+  shell_prompt: '⚓ \e[94m\b\[\e[00m\]:\e[90m\W\e[39m $ '
+```
+
+![](img/prompts/prompt3.png)
+
+
+## Date/time
+
+This example uses a custom date/time format along with 256-color codes:
+
+```yaml
+  shell_prompt: '\D{%y/%m/%d %H:%M}⚓ \e[38;5;141m\b\[\e[00m\]:\e[38;5;29m\W\e[39m $ '
+```
+
+![](img/prompts/prompt4.png)
diff --git a/docs/img/prompts/default.png b/docs/img/prompts/default.png
new file mode 100644
index 0000000..85287b8
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diff --git a/docs/img/prompts/prompt1.png b/docs/img/prompts/prompt1.png
new file mode 100644
index 0000000..bb26a6b
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diff --git a/docs/img/prompts/prompt2.png b/docs/img/prompts/prompt2.png
new file mode 100644
index 0000000..7e6c4f2
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diff --git a/docs/img/prompts/prompt3.png b/docs/img/prompts/prompt3.png
new file mode 100644
index 0000000..f81b11e
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diff --git a/docs/img/prompts/prompt4.png b/docs/img/prompts/prompt4.png
new file mode 100644
index 0000000..693d416
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diff --git a/mkdocs.yml b/mkdocs.yml
index 0a68d03..b599b8b 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -22,6 +22,7 @@ nav:
     - Start an exploratory shell: shell.md
     - Use bulker in a multi-user environment: multi_user_environment.md
     - Host- and tool-specific settings: settings.md
+    - Custom prompts: custom_prompts.md
     - Use a bulker registry: registry.md
     - Use images with entrypoints: entrypoint.md
     - Disable user or network map: advanced_templates.md
diff --git a/requirements/requirements-all.txt b/requirements/requirements-all.txt
index bcc8626..645664a 100644
--- a/requirements/requirements-all.txt
+++ b/requirements/requirements-all.txt
@@ -1,4 +1,4 @@
-yacman>=0.6.6
+yacman>=0.8.1
 pyyaml>=5.1
 logmuse>=0.2.0
 jinja2