Opera used to play embedded MP3 files in websites like ucollective and bandcamp on my last win98 install. I don't ever recall doing anything special, it always worked.
I got a new motherboard and started over and starting with Opera 11.64 and Opera 12.02, and I did not keep any backups of the old OS install to do any kind of testing on.
On my laptop I got the same problem, that one never played embedded MP3s in any site. embedded OGG and WAV files play however.
No such problem in XP SP3, all formats paly fine.
Does anyone know any solution to this problem ?