I am not on a unity/isis setup. I am just using a 2.0 T G-drive. It does not only happen when scrubbing. It is mainly after I copy MXF files into the proper folder structure, but it does seem to glitch when I open a new sequence (after the copy) and try to play certain clips. The media is on the G-drive. I am using Black Magic to link audio to the stereo speakers and video to a LG monitor, but even with that off the problem still occurs. The sequence does have effects, but even when rendered the problem occurs. We are using mostly MXF files. I AMA’ed some files but then transcoded them BEFORE using them in a sequence. Some people have told me that Mac OS X 10.9 Mavericks doesn’t play nice with Avid 7.0.4. However, Avid has made a statement that it works. If it is Mavericks that is the problem, I am not sure how to fix it as Mavericks is the operating software the mac came with. Downgrading to Mac OS X 10.8 Mountain Lion is not recommended. Have you ever downgraded a Mac software? Crazy how having the newest/latest software, which should be a good thing, could be the issue.