I’m on a Mac Pro 2x 3.2 GHz Quad Core Intel Xeon Machine with 10 gigs of ram and Aja Kona Card. We work on Final Cut Studio 2 version 6.0.6 and After Effects CS4. We are putting a cut together of just talking heads on a greenscreen and exporting each shot individually to key out in after effects and add graphics, supers, titles etc. Then we are exporting the shots out of After Effects back to final cut. The issue is once those files are in aftereffects usually like 6 out of 20 will just go offline and wont play even in quicktime. I really can’t figure this one out. I hope thats enough info sorry for not being so detailed. My condolences lol.