I can’t help, but i can say that I installed bbPress with absolutely no problems. did this start as soon as you installed bbPress? Or do you have code does more than installation integration (ie, shared headers, etc).
Since you just installed bbPress, I would recommend uninstalling bbPress (files and tables) and reinstalling. This will force you to go through the installation process again; perhaps you entered something incorrectly.
Also – did you install bbPress as a subdirectory of your WP install? I recommend doing so.
Problems with the widget arrays as well again. I see them under misc. circumstances now. This could point to a problem with the widgets options. I made a post inside another thread on how to clean them as well.