I have almost the same problem with my friend mogaka.
I have CB 1.2 RC3 installed and integrated with Fireboard. The problem appeared suddenly as I was changing some parameters at CB general congiguratiom settings. I remember that after apply, the page delayed to refresh unusually and then the problem started.
I can't see any modules at CB registration page, and also at user login page (when I try it from Fireboard ),and at "lost password" page of CB.
The errors I get are these :
Please help:(