Yep - I bought the D100 and after using it for the first time - I got the same issue - glitching after 5 minutes of playback - it slowly gets worse and worse..
I am pretty sure it is a buffering/latency issue. I like to use itunes but if there is some device that can take offer a wider range of latency settings - that would be better...
Well - my set up is as follows -
itunes playback at - 24bit/96khz using ALAC files recorded at 16bit/44.1 khz
itunes playback > Audigy x-fi sound card > altec lansing 5.1 surround sound = No problems
itunes playback > USB > Yulong D100 DAC > headphones = cracking - glitching after 5 minutes of playback
Is there any USB driver that I can use to offer me higher latency settings that itunes/quicktime (quick time can offer me 0 ms to 99.000ms only) I want a driver only for when I use USB audio and not when I use regular playback through my sound card speakers.
Or a plug in for quicktime that can offer me higher latency to solve the glitching...
Also - if I set itunes to higher priority in the task manager - will there be any improvement or negative side effects??
The thing that bothers me is that the D100 is supposed to be an acting as a soundcard BUT it says on the manual that the D100 doesn't need a driver to run on any OS.
It is a shame but I do think the issue is not the Yulong D100. Just because the D100 can accept audio input of upto 24bit/96khz doesn't mean that the OS and the playback software are adequately working together to provide a smooth continuous stream of information to the D100.