It almost seems like there are files missing in your deployment, maybe because of a bad gather. Ideally I'd love to have a session with you to figure this out, but I think at this point we should probably go off to official channels and make sure we get this properly documented (I'll follow up on the forums on what this ends up being so that people know)...
One thing you can try really quickly though: Clear out the following:
- Everything in WebUI Sites (C:\Program Files (x86)\BigFix Enterprise\BES WebUI\WebUI\sites) (but keep the sites directory)
- Everything in WebUI mirror (C:\Program Files (x86)\BigFix Enterprise\BES WebUI\Mirror) (but keep the mirror directory)
- The WebUICommonState.db file (C:\Program Files (x86)\BigFix Enterprise\BES WebUI\WebUICommonState.db)
That should allow the WebUI to pull again fresh from gathered sites from the platform. Once you do this, all of these files and dir should regenerate, and after a while, you should have the WebUI up and running again.
If that doesn't work, can you follow up with our support team so that we can get this documented as a PMR?