404 Not Found Error with Forums Options and Options buttons with JS en

[Defenestration]

I'm using the Firefox 2.0 RC2 hourly build 2006100412 along with the NoScript extension. When viewing the new IPB 2.2.0 beta 2 forum with JS enabled I get 404 Not Found errors if I do the following

1) Click on either the "Forum Options" or "Options" drop-down button (below the "New Topic" button) to bring up the drop-down menu.
2) Move the mouse cursor

** New window/tab opens with the following error

Not Found

The requested URL /[object HTMLDivElement]was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Apache/1.3.36 Server at www.forums.invisionboard.com Port 80

No error occurs when JS is disabled.

No error occurs with IPB 2.1.7 with JS enabled, so I assume this is a new bug with IPB 2.2.0 beta 2.

[Defenestration]

I've just noticed that the topic title has been truncated (ie. the last word should be "enabled") despite the fact that it was allowed when I originally created it. Is this also a bug or a feature ?

[Defenestration]

The 404 error also occurs with the Search drop-down at the top-right of the window (ie. to left of Help button on the top menu). It seems to occur with any drop-down.