Item6611: WYSIWUG simply not working always going to RAWEdit

Hi after I upgraded to 5.0.1 version the WYSIWYG plugin stopped working at all. With any kind of browser, all I get is Raw Edit, and I don't have a clue how to debug it.
I see no errors neither in the warn log or in the access/error logs of the apache .
My system is Fedora 13, with Apache/2.2.9 (Unix) and TWiki-5.0.1, Sun, 10 Oct 2010, build 19570, Plugin API version 1.3
The only thing I could see as some notation of problem but found no reference how to solve it is following :
This handler is deprecated - please check for updated versions of the plugins that use it!

I tried numerous times to enable/disable the plugin together with the TinyMCE, but all the time the WYSIWYG button or link redirects me to the RAW edit.

The link I got from it is "http://mytwiki5.0site/bin/edit/Main/WebHome?cover=%COMPOSER%&t=1291109972"

I cannot edit the COMPOSER variable to set it to Kupu, since there is no Kupu editor anymore. In summary the Twiki is not usable, since only me as admin is happy with the RawEdit no one else is willing to use it.

-- TWiki:Main/YavorGeorgiev - 2010-11-30