This is an informal bug report, but it's really easy to reproduce.
1) open jit.window help file
2) toggle fsmenubar attribute to be off
3) enter fullscreen mode
4) while in fullscreen mode, hit apple+` to pull up the patch window
on top of the jit.window in fullscreen
5) close the patch
The result is that you will have no max menubar as well as no patcher open.
latest jitter 1.5.2/max latest
osx 10.4.5 pb 1.67