I'm afraid I can't spot any server issues around this time. I'm pretty sure no developers have done anything either which could cause this. Hopefully it was a minor temporary issue.
Why would a log out cause an issue, couldn't they just log back in to complete the attack?
When I tried to log back in, I first got a server error message, then when it did load, it simply wouldn't let me log back in.
This only lasted a few minutes, but it was poor timing. :)
I am thinking it might be linked to my using two different browsers when chaining - I've been unexpectedly logged out when doing this in the past, but it's odd it happened to others at the same time.