I've set the prerecord time in the TV Server Configuration to 1 minute (I've even tried 2) but the recording starts only at the scheduled start time of the program. This feature has worked correctly for me in the past but not now. I recently had to switch to a Hauppage WinTV HVR-950 USB tuner stick from an internal tuner card. Is this the cause of my problem? Whether or not it is; what do I do about it?