I have a video project I need to work on at home, but the problem is I only have After Effects CS4 on my computer at home and CS5 is what runs in the computer lab. Up until now, I've been unable to switch between the two. It absolutely won't open a CS5 in CS4, and if I try to open a CS4 in CS5 it clears the file and acts like nothing is there. So my question is are there any settings I can play with to get CS5 to properly run a CS4, or am I just SOL? Thank you!