[TYPO3-english] HTMLarea not working on update to 4.2.6

[Tomaz Zaman]

Hey guys, i have just update my typo3 installation on the server, but 
now when i try to load html area, i get the following errors:

[HTMLArea::initIframe]: Failed attempt at loading stylesheets: 
[Exception... "A parameter or an operation is not supported by the 
underlying object" code: "15" nsresult: "0x8053000f 
(NS_ERROR_DOM_INVALID_ACCESS_ERR)" location: 
"http://www.domain.com/typo3temp/rtehtmlarea/htmlarea_000dbb6543e98e8d631a.js 
Line: 1066"] Retrying...
[HTMLArea::initIframe]: Stylesheets successfully loaded.
[HTMLArea::initIframe]: Design mode successfully set.
[HTMLArea::initIframe]: All plugins successfully generated.

I have tried searching this mailing list and forums but no solution 
works for me...
The strange thing is i have severall installs on different servers, and 
just this one is malfunctioning...

Thanx

Tomaz Zaman