I'm having this problem as well. :/ Made a post too before I saw this one, but it's in the wrong spot. Ahwell.. Didn't realize Demigod had it's own spot.
Anyways.. Yeah. This is lame. And it's not my installation or anything, since I tried other people's in the houses accounts on my computer to see.. And I get on them just fine. Also, when my boyfriend looked at his friends list, it said I was still online and IN a game. Are our accounts just stuck as logged in? 
... Wtf. I swear just 30 seconds after I posted, I tried for the 42732793 time in the past like.. 5 hours.. And bam. It logs me in. Hope it's fixed for you too, Kraks.