So, this one is a real head-scratcher! When I start AE, my preview panel defaults to having my RAM previews loop when playing, which is exactly what I want. The problems is this: When I create and attempt to playback RAM previews, it will play once, then stop and clear the last 10% of frames from memory. In order to get it to loop properly, I need to cycle through all of the playback options (oscillate, play once, loop) until I finally get it to loop. Once I select loop (even though it was selected at startup), it works properly. I am running CS4 on a Mac Pro. In speaking with a colleague, he used to have the problem on CS3. No one else in my company is having this issue.
Any and all insights would be greatly appreciated, as this is REALLY annoying.