[Pharo-dev] Is there a way to understand why rubric (playground) does not highlight code?

Hi. Sometimes it happens that playground does not do the syntax highlighting. This is especially frustrating when you open a new window and text is either white or transparent i.e. you cannot see what you are typing. I guess this is because some process is blocked by another one. Is there a way to check it? Because I want to understand whether it is because of me, or not. Cheers! Uko