Been working on a project since about 8 pm (currently 12:32 am) when suddenly, after effects CC 2014.1.1, crashed. Nothing else than a "program not responding" window popped up. I decided alright no biggie and went back to work on it. It crashed even faster. I can hardly RAM preview a clip without it crashing. However, it only occurs on this project. I opened up another project and RAM previewed the whole thing. Moved some stuff around, added things, it worked just fine. Attempted the other project and the same problem occurred. I am running Windows 8.1, please help.
(It always gets stuck when it says "locking existing frames")
Flush the media cache, turn off MP rendering.