MC seems to crash on me quite a bit for various reasons. Today I tried to change from one library to another and MC immediately exited. When I brought it back up it was in the new library. Earlier today I navigated from Playing Now to Videos and MC again immediately exited. These are just a couple of examples from today alone, I get this kind of behavior quite often. There doesn't seem to be any particular pattern that triggers the crashes, just random, generic tasks.
Media Center Registered 11.1.196 -- C:\Program Files\J River\Media Center 11\
Microsoft Windows XP 5.1 Service Pack 2 (Build 2600)
AMD Unknown 991 MHz MMX / Memory: Total - 2095 MB, Free - 1592 MB
Internet Explorer: 6.0.2900.2180 / ComCtl32.dll: 5.82.2900 / Shlwapi.dll: 6.0.2900 / Shell32.dll: 6.0.2900 / wnaspi32.dll: N/A
Ripping / Drive F: BENQ DVD DD DW1650 Mode:ModeSecure Type:Auto Speed:Max
Drive G: _NEC DVD_RW ND-3550A Mode:ModeSecure Type:Auto Speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: No / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / Drive F: BENQ DVD DD DW1650 Addr: 0:0:0 Speed:48 MaxSpeed:48 BurnProof:Yes
Drive G: _NEC DVD_RW ND-3550A Addr: 0:1:0 Speed:48 MaxSpeed:48 BurnProof:Yes
Test mode: No / Eject after writing: Yes / Direct decoding: Yes / Write CD-Text: Yes
Use playback settings: Yes /
Not sure where the "AMD Unknown 991 MHz" Sys Info is reporting comes from. I have an AMD X2 4600 Dual Core.