Hi,
I'm also having trouble with this. My problem is the same as described by Axel in this closed topic: http://forums.pioneerdj.com/entries/24888057--CLOSED-Error-E-8302-on-several-mp3-tracks-with-XDJ-R1
He's having trouble with Axwell, I'm having the same problem with Avicii, two of my friends are having the same problem (they are having their own xdj-r1s and usb memories). Tried to rename Avicii to Tim Bergling for some of the tracks, didn't work. Tracks are playing fine on the computer and on other cdj's.
Gavin, please make sure the engineers are aware of this problem which have not been solved in any firmware update. Most possible reason to the problem are described very well by Axel in the topic referred to above.
Any information if this problem is being worked on?
/ Tobias