If you don't have anything to work on, here's some troubleshooting info for the quoting-problem :)
I quoted a reply in a thread and my post ended up with the html-code visible. I checked the source and noticed that the greater than and less than signs around the html-code was coded as & gt ; and & lt ; (w/o the spaces of course). I guess the editor sends some weird info when posting using Opera. It doesn't send pure text?
T.