My first two tries at posting "FM80 stuck at low power on second day of use" seemed to be successful, but the topics never appeared on the forum. I thought maybe they needed moderator approval or something, but I couldn't find any confirmation of that.
Turns out topics created using Opera10 just disappear. I can use the editor, preview the post, set all the options, and Submit the page, but I get dumped directly back to the forum topic I was posting to, no confirmation message, no display of the new topic. But no error message or obvious problem, either.
As you can (I assume) see above, I can Reply from Opera, but I tried to create a similar "Test" topic in Website & Forum using Opera, and it apparently disappeared.
Short of making this work properly, maybe you could add a note telling us that if we don't see our new topic displayed in a new window immediately after clicking Submit, it probably isn't going to appear anywhere ever, and we need to try a different browser...