Hi Brandon,
Got exactly the same issue, but it appeared after upgrading AE CS5 from 10.0.0 to 10.0.1 version (10.0.1.19). I haven’t had this issue before that with out of box install. Reason for updating was my frustration over speed of rendering… Researched a couple posting related to 32 bit versus 64 bit mode of MAC OSX, and I was hoping Adobe’s update could fix that. Well, looks like rendering performance issue has gone, but now I can’t use my workflow any more… Exactly the same green pixelization… Did you manage to resolve this somehow?
Brani