Object doesn't support this property or method ERROR

Hi,

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: 285009749
Char: 434
Code: 0

(line number changes depending on page - char 434 is the same)

Works fine with Firefox.

Any ideas?

Thanks