This sounds like either a codec or video driver issue to me. I'd recommend you first upgrade your video drivers, and if the issue persists, try removing any codec packs you have installed.
Already tried clean install of two nVidia driver versions-
320.49 (latest official)
320.18 (previous official)
Guess I keep going back and back and back, hoping one of them works???
I do not touch codec packs. The only codecs I have are installed (& updated) by by Zoom Player MAX v8.6.1. Does WMC even use any of these? I don't see any extra taskbar icons when WMC is running (like when I play audio/video in ZP).
DCoder's Bass v184.108.40.206
LAV Filters v0.57.00
Haali's Media Splitter v1.11.288.0
Flash Video v220.127.116.1133
DScaler MPEG2/AC3/DTS/DVD v0.0.6.0
Open Source DTS/AC3/DD+ Source v18.104.22.16833
Gabest MPEG and Bluray Splitter v22.214.171.12433
Gagest AVI Splitter v126.96.36.19933
Gabest CD-Audio v188.8.131.5233
FFMPEG Core Filter
DCoder Image Source
How about a remote with "stop" built in to the shut down procedure? I have been doing this with my Harmony 900 for a long time and don't have this issue at all. When It powers back up with the HTPC activity, it goes right to LiveTV on the channel last tuned.
Yes, I can do macros with my AR Xsight. Issues:
1. I am comfortable using the AR Xsight all the time, the rest of the people here are NOT. And the universal remote they use does not have macros.
2. Coincidentally, my AR Xsight refuses to learn some WMC functions. One of those functions it can't learn is the STOP button. Other options are available.
3. I would need to create an alternate "music channel". Many choices available.
4. It would have to be two separate buttons- one for "Off" another for "On".