I have no clue what is causing your problems. But, I had 14 pages of critical errors on my site. Same version. I just started removing mods until they stopped.. No clue what caused it.. But, I think, in my case, it was the User Control Panel mod.. I LOVE that mod, but something in it doesn't like one of my other 41 mods.... So, it had to go.. Cause I am NOT going to try and narrow down what other mod it doesn't like. With it gone, the errors went away..
So, you need to start removing mods.. If you only have the one, then kill it. Cause a fresh install of 2.0b3.1 never gave me any errors at all ever. But, again, I had 14 pages of critical errors, and that was in less than a day. Thing is, you'll get 8 for one user doing one thing.. so they can add up very very fast. Nothing to get all worked up about. They shouldn't kill your system or your forum.
Greg