Extracted the contents of that v481 zip to my v480 install and tested again but no change, still black screen with audio on startup of vids in TVS, stopping and restarting the video brings it to life BUT only on starting at last position, restarting at start gives the black screen again but only when the vid has not yet displayed. The same vid plays without problem from Videos I think this is a quirk in TVS/Madvr we had it a while back if you remember on my HTPC and it seemed to be down to Madvr settings. The .mvc 3D vid playing in SBS is a bit strange, it does not respond to the play in 2d setting in Auto3D either, but again could be Madvr settings.