I am guessing if you copied all the files at once by pressing copy all, it also copied the name of the stick. then you have to click open the stick to see the files. Happened to me. You have to copy the files one at a time or the pa900 looks in the wrong place.because it changes the location numbers on the stick. Just a guess but try it. It couldn't hurt
Good luck
Mel
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KORG PA1000, KORG PA900, 2 BOSE S1 PROS, 2 BOSE L1 COMPACTS, YAMAHA STAGEPAS 500, ROLAND VP7