After messing about a bit I got it working again. I suspect it's because I changed one or two of my details, so if you've changed any of those since you made your account, you might want to try shifting them back as doing that worked for me :3
I've just suddenly started getting this myself now. I logged on fine just an hour or two ago but now it gives me the old password/username error you guys got :/
Kinda controversial but I'm not entirely sure why Demigod even needs rotation... kinda complicates things without really needing to. Maybe it's just personal preference but I prefer fixed-view for this kinda stuff; if it has manual rotation I'll just find some roughly isometric angle I can see well enough from and then just pan :p
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