Okay, so I've been using the awesome sonar reference3 plugin with my Sennheiser headphones perfectly well for a couple weeks now (ASIO to external DAC/amp). When I first got JRiver, I wasn't using it. The only DSP I had running was the tempo/pitch control... I lower the pitch very slightly in order to reduce fatigue and harshness, it is very close to being the 432hz concert pitch, but that's a separate discussion.
The problem was, I forgot I had it turned off since I got the sonar plugin. Today, I remembered and switched it back on, and suddenly the music starting stuttering/skipping in very precise, non random ways... almost like someone was turning the volume off and on steadily. I checked task manager to see if it was hogging CPU usage and it wasn't, not even close. Hovering right around 15%, so it wasn't that.
The reference plugin and the pitch control are the only two DSPs I have running, so I'm not sure what the problem is. I even tried raising the buffer on the ASIO control panel all the way, and it helped slightly, but not very much.