I just got this running through an exit:
Error running script: Error evaluating expression 'style + "font-size:" + ToString(size) + "pt;"': The given key was not present in the dictionary.
Error running script: Error evaluating expression 'value = null or value = "true"': Unknown object or variable 'value'
Error running script: Error compiling expression 'LengthOf(font) > 0': FunctionCallElement: Could find not function 'LengthOf(Object)'
Error running script: Error evaluating expression 'DictionaryItem(coordinates, coordinate)': The given key was not present in the dictionary.

(The only thing I did with font was in tabs, in the game tab. I have not changed font size or written or added anything with "pt" in it.)

That's really weird; the first line doesn't even mention a dictionary.

I'd expect something similar if the font size was set to a non-numeric value; but the error message would be different. I'll have a look at that function and see if I can figure out what's causing it.