It occurs for me in J. River Media Center with the latest build on site (12.0.251). I have noticed it for a long time however, but can usually live with it.
G-Force is fine except for when a song stops playing either by pressing the stop button or the song ending. Transitions to new songs are perfectly smooth. Essentially the entire program locks up on a song stoppage, but everything else in Windows works fine, just not MC.
I just recently noticed (hence the post) that the issue is replicated when my PC is booted up with Media Center having G-force set as it's default display playing now option. If I reboot my PC with media center not having g-force as the default, but then after starting MC, I then play a song and then select g-force from say just album art, no issues occur until the next time I reboot with g-force as the default. A reinstallation also makes the issues disappear until I reboot.
This issue does not occur at all with WMP.
I am running g-force 3.6.2 platinum eddition.
Microsoft Windows XP 5.1 Service Pack 2 (Build 2600)
Intel Pentium M 799 MHz MMX / Memory: Total - 1293 MB, Free - 582 MB
Internet Explorer: 7.0.5730.11 / ComCtl32.dll: 5.82.2900 / Shlwapi.dll: 6.0.2900 / Shell32.dll: 6.0.2900 / wnaspi32.dll: N/A
Ripping / Drive D: SlimtypeDVDRW SOSW-852S Mode:Normal Type:Auto Speed:Max
Digital playback: Yes / Use YADB: Yes / Get cover art: Yes / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / Drive D: Slimtype DVDRW SOSW-852S Addr: 1:0:0 Speed:24 MaxSpeed:24 BurnProof:Yes
Test mode: No / Eject after writing: No / Direct decoding: No / Write CD-Text: No
Use playback settings: No /
