About spam: while i was downloading the email through imap, i also got the same problem.
I suppose that's the spam filter "learning".
The solution is simple: go to gmail and clean the spam folder. Then, go to opera, select all of the emails on the spam folder and select "not spam".
After i did that, no more non-spam emails got in the spam folder. (and i've already received a few spam emails that did get in there.
nontroppo: yep, i also noticed that most of my emails that got in the spam folder were chain-letters and alike.
One thing i love about this new config is that i've created a hotkey to toggle "spam state" of messages. It's VERY useful, and really fast!
Of course, i found out how to create it through
nontropppo's great opera wiki!