just today i stumbled upon something that might be a Firefox bug in 3.0.5 - probably with an Add on resp. extension. When running Firefox in safe mode (firefox.exe -safe-mode), it’s working and it’s way faster. Didn’t find out yet which add on is hurting.
That said, in FF 3.0.5. TinyMCE in backend and frontend of Modx 0.9.6.1p2 doesn’t display content in the WYSIWYG edit area, even not in HTML view. But the content IS there, document preview shows that it is.
This is affecting several MODx sites and installations I manage. This is true for the Windows Version of Firefox 3.0.5., running XP SP2.
Firefox on Mac and IE7 on Windows are not affected.