I am working on AfterEffects 14.2.0 and am having problems with the preview window. Only a small section of the composition plays back before looping back and playing the section again. I have never had this issue with AE before, and the MacBook Pro I was working on before had less memory than I have now.
show us please with some screenshots/video capture.
Are you still facing this problem? If not, let us know how you solved it. If so, please let us know so we can assist you further.