Look in Contents Manager to see if there is any faulty content showing. If so, try "reverting" to "origional". If that doesn't fix the fault/y, then just delete the faulty content.
Then check for missing dependancies, and download them if you can. Again, detele anything that shows up faulty!!!
If you are running Platinum, then make sure you have downloaded all the updates, eg" the truck load of additional routes, sessions and additional Tane content!!!
Then I would try is a FULL database repair. Worth a try if you haven't already tried. Hopefully that fixes the problem/s...
Cheers, Mac...