We can also no longer use the main project web access site. The same
error displays. All other share point sites seem to be okay.
Unfortunately, since google hasn't given up too much, I don't know too much.
EggHeadCafe - .NET Developer Portal of Choice
http://www.eggheadcafe.com
I ended up deleting my PWA site, running the project server 2007 repair
from the installer, then recreated the PWA site and it seems to work right.