[TYPO3-english] TinyMCE gzip cache file couldn't be created

[Sergio Catalá Gil]

Hi list, 

I've updated this morning some of my extensions, and afterwards, when I
tried to log in the backend, I receive the next error popup:

"TinyMCE gzip cache file couldn't be created"

After accepting the popup, I can manage my BE as usual. 

As I updated so many extensions, now I don't know what could cause this
error. Any hint? I googled but I didn't find anything. 

Thanks in advance, 
Sergio