I haven't found any that play backwards yet. I've had a couple play extremely slowly and a couple with kind of rasping noises in. I've also got loads of tracks which I know are VBR but the player thinks they're Fixed Bitrate so the timecodes are completely up the wall. I'm aware there are other people who are in the same boat where this is concerned. I think I read in another thread that this can be caused by the encoder that Musicmatch (& possibly others?) uses. I'm waiting to see if the guys can do anything with either emplode or the player software to eliminate this problem. I know that strictly speaking it's an encoder problem but I didn't have a problem with these files in 1.03 .

Marcus (beaker)
32 gig (various colours)
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Marcus 32 gig MKII (various colours) & 30gig MKIIa