[TYPO3-english] TBE_EDITOR is not defined

[Leander Seige]

Hello everyone,

I'm getting Javascript errors when logging in as backend user (typo3
4.2.5/6). When I work as admin everything is fine but when I log in as
an ordinary backend user, select the page module and a page in order to
edit it, then switching between "quick edit" and "columns" the columns
are never displayed and I cannot edit anything. Instead it throws errors
like: "TBE_EDITOR is not defined"

originating from line 34 which reads (according to FF's Javascript error
console; looks like it comes from the ie compatibility js):

//
if (document.editform && TBE_EDITOR.isFormChanged)	{	
//

I think even if I missconfigured my backend user I should get some
"permission denied" errors or something, but not this kind of
dysfunctionality.
My main site runs 4.2.5, where I noticed the bug, so I upgraded a 100%
copied testinstallation to 4.2.6 but the error doesn't go away.

Similar errors happen in Seamonkey, IE and Opera.
Any suggestions what to do?

Thanks,
Leander