This is of absolutely no help to you right now, and unfortunately I don't have any insight to your current problem...however, I will just add that when ever I restore my data using Titanium, I pretty much always go through it and manually update only the apps that I've downloaded and/or I know specifically are safe to restore. I don't touch any of HTC or other system apps, mainly to avoid issues like you're describing.
Again, sorry I can't help, but figure this may at least prevent a similar issue in the future.
If it were me, I'd try to boot into recovery if possible and flash my last working ROM and start over.