I thought I had resolved my stuttering playback problems with 24 bit 96 Khz flac files after I formatted my cards to fat32 in the X5 and then re-copied all of my music back to the cards. Unfortunately with beta 2.07 the problem has returned on certain albums. My 16 bit flac from CD files play fine, but as an example "American Beauty", a very well mastered 96 khz Dead album from HD Tracks, stutters from time to time on different tracks for a few seconds - it's unpredictable and occurs in different files and locations each time. It's a problem when an advertised "HI-Res" player can't play hi-res files properly.