Why I cannot RAM preview in CS6 with the same settings I've used in 5.5? In fact I can only RAM preview when I disable After Effects Multiprocessing.
Am I missing something here?
You are not telling us anything. No system specs, no project info, no footage info, no nothing. This is just a hollow "My car doesn't run" post. Provide some details and we may be able to help. Otherwise this is going nowhere.
If you are using CS6 in the NEW Ray Tracing mode (extrusions / shadows, etc), the only way to ram preview is with multiproc OFF. It wont let you use MP.
It tells you this with a full screen text statement when you first switch into that mode from the older regualr 2.5D mode. Check it out the next time for other limitations.
I'm having the same problem. It just stopped working mid-session. It was just after I'd been playing around with seeing how the image quality changed between Ray Traced and Classic, so I'm thinking maybe there is a bug there. If I start a new project, render a few frames of a test comp without MP, then switch MP back on, it works. However, if I load up the project where it originally stopped working, that doesn't work at all, no matter what I try. Might there be some sort of flag/setting in the project file that is to do with Ray Traced/Classic options that has become corrupted? I'm probably clutching at straws, but if there is a way to fix it, whether an official bug fix or tinkering around I'll give it a try to avoid re-building my project (or having to wait for long RAM previews...).
Mac OS X 10.7.4
3.39 GHz Intel Core i7
16 GB 1333 MHz DDR3 RAM
GeForce GTX 550 Ti 1536 MB