I have a stereo piano track. I set it up for Flex Time Polyphonic, and just enabling one of the flex markers creates what sounds like a phase issue that kicks in (with a little pop) some seemingly random time before the marker (easily under a second). I haven't even moved anything yet. Sometimes it doesn't seem to happen, but when it happens it's reproducible every time. What's really weird is that the point where the click occurs can move around when I'm looping the track. Any ideas what's up?