[TYPO3-english] Can't save TypoScript in backend

[Andrey Vasilyev]

Hello!

For some reason I can't save the TypoScript in Constants or Setup text areas. When hit save button the the frame with RTE editor just goes white blank. If I try to edit the same TypoScript again backend shows the same text as it was before I tried to modify it. So the save button doesn't work! What could be the reason of such behaviour? May be something is wrong with persmissions?

I have TYPO3 4.5.25

Best regards,
Andrey.