I've recently upgraded some studio gear and I'm having issues with the 11R. I have the 18i20 linked to an Octapre mkII Dynamic via ADAT and the 11R via S/PDIF. I have all the clock sources and bit rates synced, with the 18i20 as the Internal source. Here's my dilemma, with the 11R, i am getting audio fine but with pops and clicks. Both with and without the USB plugged in. I need the USB so the 11R sees the editor for tweaking patches. Thinking it was USB that was clashing with the 18i20 USB input creating the clicks n pops, I disengaged the USB, but still have Clicks n pops. How can this be resolved? If not I will sell the 11R and buy software sims. I'm using PC Windows 7 64 16gb ram thru protools 12.2 Cheers in advance.