I get stuttering when using MC 20 with a Benchmark DAC 1 HDR. It happens every time, and I have rebooted several times to no effect. I am new to MC 20 with the MacBook Pro and have done no adjustments yet, although I have used MC 19 with a Lenovo T 60 running Windows XP for several years now with the same DAC and have got very good results, except for several instances of the program freezing when using it with the JRemote ap on an iPad. Any help or suggestions for adjustments anyone? Thanks!