New
#11
Go here which you already know with your Opera. The three tabs on the right. Clear them- click delete all sites.
Removes all Flash cookies. I just did mine and MSN games, miniclip, National Geographic jigsaw puzzle all still work. Clearing the cookies didn't hurt and some of them I don't know what they were anyway.
Only thing I can think of at this point if you went through the trouble shooter link already.
Adobe - Flash Player : Settings Manager - Website Privacy Settings panel