Toggle comments dead in IE – bug?

Toggle Comments does not work in Internet Explorer, while it works fine in Firefox, Safari, etc.

I’m trying to use P2 in WPMU/Buddypress, for the member blogs. I understand it’s not designed for that, but it should work, right?

I’ve now tested it in a clean install of the latest WPMU, without BP or any plugins. Toggle Comments is definitely broken in IE.

In default settings when you load the site you see the Hello World post with Mr WordPress’ example comment.

When you click on Toggle Comment Threads the example comment is replaced by these links – so far all OK:

Mr WordPress is discussing. Toggle Comments

But when you then click on Toggle Comments, nothing happens. The address of the link is http://mywebsite.com/# Ajax does not recognize the link.

When you click Toggle Comment Threads, the ‘Mr WordPress is discussing…’ line disappears or comes back if you click again, but the comment itself is never seen from again.

It probably has something to do with differences in how IE handles CSS, probably the class ‘commentlist’. Function p2_toggle_threads() is in inc/js.php

I can’t figure it out. Any thoughts very much appreciated!