Just checked out the youtube video--eek that looks really bad--my only thought (and I don't have a mac) would be to remember to update your display driver--what video card do you have on the mac??--(update your operating system first with whatever mac updates available) I've had some funky things happen when the video card was out of date on my windows machine when I first started out. Maybe you can try and disable the mercury playback option?? (project-->project settings-->general---->video rendering and playback) Please let us know if you figure it out or if any of this helps
Thank you for your input. I have not experienced any issues in the past few days. It seems as if this issue occurs spontaneously. The next time I experience issues, I'll refer back to this and give any feedback. Thanks again!