Can't stay logged in?

[Rafael]

I briefly looked into the matters at hand; seemed to me you guys might have been hacked - like, as if some idiot tried to, and didn't well succeed.

Now, granted, I am not following what you guys do here, and I see the URLs have changed.
If there was a server change, this might well be a post-change hickup that can be easily fixed.

Otherwise, you might want to work on the overall site security; phpbb just released a new security patch a few days ago. Might be worth a look.