[TYPO3-english] IE9: Upgrade TYPO3 4.7.4 -> 4.7.7 makes BE crash when saving through RTE

[Bert Hiddink [BENDOO e-work solutions]]

Hello,

I just updated several sites from  4.7.4 -> 4.7.7 and got feedback from 
clients that in IE9 only (!) when saving through RTE (hmtlarea latest 
version), the Backend and IE crashes completely. When logging back in, 
data are saved but got no idea why this upgrade makes IE crash.

Any help/ideas?

Thanks in advance!

Regards,
Bert