Normal
Well just to cap this off, i got mediaportal working fairly stable by switching back to version 0.1.3. The issue didn't appear to be with any external software but with the Mediaportal TV database files. I found that everytime I got the "This card does not support auto tune" message I could delete the tv database and then go back into MP and auto tune. I could then watch tv for a little while but after going in and out of the guide a few times the TV would just go black and stay black. Deleting the tv database file would fix it up again. Anyhow, 0.1.3 doesn't seem to have this problem and I can finally watch all (5 aussie) channels and record and everything! MP's looking great, can't wait for the next version to see what goodies are in it!
