I had a corrupt file that causes TestComplete to crash upon opening. The error onscreen said there was a problem with the tcKDT.pls module, but in reality one of my tests had a bad non-ASCII characte...
Ages ago I asked for access to the error log. I don't even care if the onscreen message is vague, if you give us access to whatever it is that support is looking at, then we can learn to look for the errors on our own and not have to wait days for a response to a support request.
I agree that this is very frustrating.