Just purchased DVBviewer after using mediaportal for a while, it seems a bit too unstable for me, I've been in the nztivo scene for a number of years so am used to stability.

Just following the DVBViewer guide here http://www.geekzone.co.nz/Fossie/4566
and when it comes to scanning the frequencies it doesn't find any channels. Scan finishes in 5 seconds.  Pic below.

If I restart the mediaportal TV Server service and scan if finds the channels fine.  So it's not my aerial.  Any ideas?
Im running Vista Ultimate with the Nova T 500 card. running on a Intel Q9300 Quad 2.5Ghz