Winamp (PC) not finding all music on my device

[mhogan]

I'm using all "Pro" versions. I synched my library last night (all 12,000+ songs) and everything seems to play just fine on my phone. But, when I try to re-sync, the PC client tells me there are over 4,000 songs that are on my device but not in my library. They're obviously on my phone because I can play them. Does anyone have any idea what the heck is going on?