There seems to be some kind of conflict between Foobar2000 and KMplayer. Whenever I start KMplayer, it causes Foobar2000 to immediately crash for some reason, even if no song is playing, and no video is playing on KMplayer.
No error message or crash dialog appears, it simply dies unexpectedly.

Another annoying thing is that Foobar2000 doesn't automatically save the playlist and its position in the playlist, so every time that it crashes, it loses all changes (I know this has already been requested before).

System information:
Windows Vista Home Premium
Foobar2000 0.9.4.5
KMplayer 2.9.3.1427

Well I'm using FB2K 0.9.5 beta 7 and KMPlayer 2.9.3.1210 on XP, and I've never had any conflicts between them.

foobar2000 0.9.5 beta 7 and KMPlayer 2.9.3.1421 on Windows Vista. No problems.

I've upgraded to the 0.9.5 beta 8, and I'm not experiencing that issue any more.