[Q] sound files not found in system

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hi, i have a Nexus build on sd which workings great when left alone.
but i still have to use window 6 sometimes for old progs.
when i restart into android (clrcad/haret) i sometimes lost the ringtones and alarm sounds and had to reset them.
now, i can see the stock sounds in the folders in system/media/audio but cannot select them in the sound settings (i could before) i can only see the few that i copied there myself. they all play fine with music player.
if i copy the same sounds (oggs) to the sdcard under media/audio/ i can select them and they work?????
any ideas?