Did you import into your AE comp as square pixels? Is your comp set to square pixels and locked to 3:2 aspect ratio?
By comp I assume you mean the exported video from AE. There is no option saying what to import it as. I click import file, select the video, and hit ok. The premiere project is the standard NTSC DV one (i`m not in fromt of it so i forget the name). And where would I check to see if the aspect ration is locked? Do you mean in Premiere or AE? In AE it was not locked. In premiere I don`t know where to find that. Remember, its premiere 6.5 not Pro.