I am using theme: BuddyPress Community 1.3.3
(when I updated to the latest 1.3.7 - same issue).
I am using IE 8
I installed WP Minify - which is NECESSARY to speed up the site.
If you click on a comment in IE - you get the following error:
Message: Object doesn't support this property or method
(line number changes depending on page - char 434 is the same)
Works fine with Firefox.