Syntax highlighting stops working when typing Hebrew letters

I use MATLAB R2012a on Fedora 16.

The syntax highlighting works well, but when I return to the office after leaving MATLAB open overnight, the highlighting ceases to work (and I also see a "returned all keys" message). I can't make it work again without closing and reopening the program, which is inconvenient.

Is there any way to fix this?

EDIT:

Sorry for the confusion. It seems that this is not at all the problem. After experiencing a bit I found that the problem is caused solely by typing non English lettes (Hebrew, in my case) in the command window. Whenever a single hebrew letter is typed in the command window (because I forgot to switch back to english after answering a mail or something...) all the text turns black. Needless to say, the problem persists after deleting the letters.

What do I do?

[Jan]

Please post the complete "returned all keys" message. Perhaps this revealy necessary details?

Answer 1

[Jan]

I do neither know the reason for this problem, nor did I saw this.

Re-starting the Matlab session might be more convenient, when you use FEX: Matlab state.

[Yohai]

Thanks, but I found that the cause of the problem is different, see the edited question.