Can you test whether this also happens on http://prototype.wikimedia.org/en-wp/index.php?title=Manchester_Small-Scale_Experimental_Machine&action=edit ?

I've got another message:

Message: Object doesn't support this property or method
Line: 208
Char: 4
Code: 0
URI: http://prototype.wikimedia.org/en-wp/extensions/UsabilityInitiative/js/plugins/jquery.textSelection.js?12

(In reply to comment #2)

I've got another message:

Message: Object doesn't support this property or method
Line: 208
Char: 4
Code: 0
URI:
http://prototype.wikimedia.org/en-wp/extensions/UsabilityInitiative/js/plugins/jquery.textSelection.js?12

I tried to fix this message in r57071. Can you try again to confirm that?

I am still getting this message. (?13 at the end.)

(In reply to comment #4)

I am still getting this message. (?13 at the end.)

Gah, I'm stupid. Took another shot in r57073, could you test?

screenshot of the toolbar

Error message gone, but I've got display problems. I attached a screenshot.

Attached:

(In reply to comment #6)

Created an attachment (id=6600) [details]
screenshot of the toolbar

Error message gone, but I've got display problems. I attached a screenshot.

Are you referring to the scrollbar to the top right of the toolbar? That looks a lot like bug 20874.

Resolving as the issue as filed in fixed.