On Wednesday, February 15, a very large update to the servers and forum software was implemented. After the servers came back up to full speed, numerous bug reports began rolling in. Issues ranged from forums not loading, the Cnet page not found error being found more often than any forum page, posts going MIA then appearing hours later, members not being able to log in or remain logged in, posts being duplicated by the system, etc.
The techs have been working on it since, and have actually come a long way, though it may not seem that way for, as you can see, there's still a lot of issues remaining. Adam, one of the engineers, has started a thread in the Forum Feedback Forum where you can report the problems you have faced and read the latest on the issue. They have come up with patches for most of the issues we are currently experiencing, though they will not be implemented until Tuesday, the next normally-scheduled upgrade day.
Hang in there.