Been running EXFat for a week. I had a similar problem to one of the posters. When I played music from a 64gb Kingston card on switch on it had the song I was playing in the main content and the last song I played from the internal memory at the bottom. It switched to the next song on the internal memory instead of continuing with the album(on the SD card) I was playing.
I switched off last track and it cured it. I haven't switched Last track on again yet.
I had problems with my Micro SD card and the X3 as you can see from the main thread so deleted and reformatted with the EXFat. I have no idea whether it has formatted as ExFat or Fat 32 as it doesn't say.
I've downloaded from a Micro Sd reader plugged in to my PC. it is more reliable than from the Sd card plugged in to the X3. I wish that the X3 wasn't so temperamental with Sd cards. I don't know if the other rival DAP's suffer from this?
I think that the 3.00EX sounds better than the 3.00. There you go I've said it and have joined the placebo/deluded gang. I'll lie down now.