>The latest and greatest version of Opera (9) has serious problems with the Universal Thread. Specifically, sometimes I can expand the "plus" signs in the message area - and sometimes I can't. I also had problems on some other sites - in Yahoo! Email, sometimes I can select messages with the checkboxes - and sometimes I can't.
>
>It might be some particular problem on my computer, but just in case, I wanted to warn Opera users about potential upgrades. Up to version 8.5, I had no problem with the sites mentioned.

Have you tried Firefox? It has no problems with the UT that I have noticed. It is basically the web browser Microsoft would be offering it they had the luxury of starting with a clean sheet of paper.