Any tips on this subject will be helpful.

I've got Mainconcept MPEG Pro HD for adobe premiere pro, and I'm having trouble exporting a 1280x720 mpeg 2 file from the software. Any hints? I'd like to export either as an mpeg2 or AVI file to imoprt into after effects at 1280x720. Thanks a bunch.

Los.

Don't use an MPEG-2 file. You can just export from Premiere to an AVI file
(pick a codec) and be able to load that into After Effects. Are you saying
this is not working?