Problem using full screen FCK when using jQuery ui tabs

Hey everyone,

I'm having a problem using the FCK editor in full screen mode in combination with jQuery ui tabs. The tabs are working fine and so is the FCK editor (actually 4 on the intended tab), but when I try to maximize the editor to full screen I get the following error in IE(7):

Line:58
Char: 1649
Error: Could not complete the operation due to error 800a025e.
Code: 0
URL: http://domain/fckeditor/editor/fckedito ... Name=etc...

It won't work in Mozilla Firefox as well (error console: D is null / fckeditor/editor/js/fckeditorcode_gecko.js)

If I disable the ui tab functionality everything works fine.

Anyone experienced in using the FCK editor with ui tabs?

Best regards,
Seth