Anybody found a solution for this? I just started having the same problem, right after I upgraded to 2.0.4.
resiny, you’re correct about this being the command to call the WYSIWYG editor (TinyMCE). You’re also correct about your temporary fix: turning off the visual rich editor makes the message stop. The error comes back on when the visual rich editor is turned back on.
I tried your suggestion about replacing the /wp-admin directory from scratch. Still no good. Tried overwriting the tinymce directory, along with the whole /wp-includes directory. Also ineffective.
Also, the message persists whether or not I have plugins turned on.
I’ve found several threads on the board describing this issue, but none of them seem to spell out a solution — or, at the very least, explain why this problem crops up.
Suggestions?