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.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)