I have noticed in recent builds, as with many people, that there have been loads of buffering and playback problems; mp3s, flacs, etc. I considered rockbox to be very stable in this respect (I use an F40) but suddenly, I find I can't rely on the most recent builds that much for playback! It has been a problem now for nearly a week, and just out of curiosity and not being ignorant, if it isn't broken, don't fix it, so why play with the buffering options recently?
:-)