update ofUITextInput via code

[Prodical]

Hi

In a previous version of ofxUI I could change the value of a Text Input box via code using the following:
char mratioStr[16];
sprintf(mratioStr, "%i/%i", mcol, mrow);
((ofxUITextInput*) guiSC->getWidget("TEXT INPUT"))->setTextString(mratioStr);

Since updating to oF8.4 and the newest version of ofxUI I can't seem to get this code to work... or any other code e.g.

string mRatioFractionString = "TEST";
mRatioFractionWidget->setTextString(mRatioFractionString);

where I've declared this elsewhere in the code:

ofxUITextInput *mRatioFractionWidget;
mRatioFractionWidget = new ofxUITextInput("TEXT INPUT", "1/1", 60, 25);

oF consistently breaks at line 393 of ofxUITextInput.cpp
textstring = "";
with an error:
Thread 1: EXC_BAD_ACCESS (code = 1, address = 0x8c)

I've been banging my head against this a while... any advice appreciated.

Best

Prodical