error when creating ofxXmlGui?

I’m getting an error when trying to create an ofxXmlGui instance in of007:

OF: OF_LOG_ERROR: Error : font not allocated -- line -1073749316 in   

Anyone seen this before? Is it a bug that should be filed or have I perhaps misconfigured something? The error is coming from the call to drawString()

resources->getDefaultFont()->drawString(name + "   " + ofToString(fval(value), 3), x, y);