I know my site highlighted a lot of bugs in Netscape 6 and Mozilla when I tried it through them. A lot of these have been resolved now though. Perhaps you should report it as a bug to the Opera team.

It is important to get these little browsers up and running as best as possible and they need all the info/feedback they can get. Sometime in the next three weeks I shall be endeavouring to make megalithomania 100% WC3 compliant.