I have an object that I used a motion tween to move around, zoom, etc. I export at 1080 x 1920, and it takes 10+ minutes, but finishes. When I go to view on desktop, it tries to open and I get a message that says something went wrong. there was no script I created in the file.
Exporting large complex animations as video from CS6 is unlikely to be successful. The frame rate isn't going to be consistent. Either use a more recent version to export videos, or export an image sequence and recombine them in Premiere.