[nonamebrand]

Some FLAC is not playing well at all, even in Rockbox. My FLAC will play well for a few seconds, then annoying "chirping" noises will be present. It'll play fine again, then play in 0.5x speed. 
 
I just uploaded a FLAC track from another album...this is more like it. This FLAC encode is playing as smooth as butter.
 
Anybody have any idea what causes those other FLAC tracks to spaz out? Firmware is the latest. Fuze is v1. 

 

[fcpchop88]

I had a similar problem with an ipod using rockbox, turned out the player couldn't handle certain flac files that's bandwidth was too big, after I encoded in -0 as opposed to -5, which is the default, they played fine. Maybe that will work with you.