It's frustrating when one has issues and appears to be the only one with the issue. Reason I say that ... if there was a major hickup in 2.4.x itself that affected all, there would be 'traffic' in these forums saying 'me too', etc..
It appears to be an issue with your system(s) ... either server or station.
The Font family pick list, Font size Style (paragraph, etc.) + Undo + Find + Find and Replace and the Toggle Full Screen bar is missing when one has toggled to full screen.
That makes it tough to return from full screen toggle with the edits and yes, can understand your frustration. :|
Am wondering if you have the same version of the editor (3.5.7b)? That's what's in the most recent git pull '2.4.1+ (Build: 20130118)'
Check the folder:
There were also some theme updates in that 'git pull'.
Have you tried switching the theme to see if it's not theme related?
Also, have the latest browser updates?
Suggest a couple of things:
1. turn on debugging ... we might get something.
'spirit of sharing', Ken