I've been using Opera (9.64, Linux) for a couple of days and I noticed something a bit annoying about the Google reader interface. A few seconds after I share an item and add a comment, the comment view turns bold - new comments have been made... But it's MY comment. I get excited over nothing :(. AFAIK, this doesn't happen with Firefox. I really need to check out google reader groups / support.
Later: It just happened under Firefox too. How to reproduce, how to reproduce...