Zero byte recordings

[chuck_2330]

I recently installed NPVR but decided to go back to GBPVR. Since then, I regularly get zero byte recordings. The program appears to record in the web interface (which I use exclusively). I have 3 Winfast DTV1000T cards and until I installed and uninstalled NPVR these have worked perfectly for quite some time. My wife will divorce me if I can't get her shows recording reliably again!

FWIW, I decided to revert to GBPVR as I found the playback of the TS files through the web interface to be very flaky. VLC would not show recording length and I could not scrub or jump to a particular time.

Help appreciated!!

EDIT

It looks like some channels are not getting a signal (not sure how I can tell??)
I'll retune the cards in the morning.

EDIT
Retune failed - it reacts as if there is no signal but I tested it OK with another tuner. I've bitten the bullet and reformatted the boot drive, installing Win7. We'll see how I go...

EDIT
I give up. I've gone back to NPVR but I can't play MPEG files. Woe!