i've noticed that the first post was last july 13... well, i'm experiencing it now and i guess the bug is back.
the bug is there on some specific computer configurations and we are still trying to figure out what that is exactly that is on which systems/parameters the login doesn't hold. The problem seems to be solved for most users, but it still appears once in a while. We'll hund it down and kill it, no worries about that. Just make sure to write your system configuration when you report this bug. What we need to know is:
1. your operating system
2. your browser and it's version
3. if the browser has coockies enabled