Just as an update to all of you. I tried everything and made the assumption that something was corrupted in Win7 x64 Pro...I rebuilt the system from ground up. The problem still exists!
I proved the following:
1. Not an isolated SW corruption issue
2. Not a HW issue
3. Not a tuner issue (bought new different one)
4. Not a tuner driver issue (different type used)
5. Not a third party SW issue (new clean build had no conflicting new SW on it)
I believe the problem was/is Comcast. Whatever they do, however they do it, something is now different in their broadcast of Clear QAM signals. The Hauppauge WinTV 7 app did find all the channels but MCE does not.
What I did to fix it is to manually enter each and ever channel and then go back and assign each and every guide schedule to them. It took me hours but now it works. Very frustrating!
I believe Media Center only integrates stations with correct PSIP information into the guide, otherwise you have to manually map them. Did you do this?
Quality Assurance Manager, Ceton Corporation.
MCTS:Connected Home Integrator, MCSE+Security, MCITP:EA, MCTS:Windows Internals, and about 25 other ones
This posting is provided "AS IS" with no warranties, and confers no rights.
I was playing around with an older AverMedia AverTVHD MCE card in windows media center because I kept missing recordings due to the Ceton InfninTV 4 crash/reboot firmware bug and noticed the same problem.
It will find several channels and will say something like 10 found. As it continues scanning, it will drop to 2 found then may say 4 found, etc.
What I had to do to get it to work was manually map them in the guide and everything worked fine. I ended up removing the AverMedia card because it gets a lot of artifacts and stuttering. Same problem I've always had with it.