Steve,
I found the problem. REALLY really stupid.
Somewhere along the line, when creating a new comp in After Effects, my comp’s default preset got changed from “NTSC DV, 720×480” to “NTSC D1, 720×486”.
I changed it back to “DV, 720×480” and everything’s fine. That was it. So simple. So stupid.
Sorry to have bothered you. At least maybe someone might see this and check their comp settings before going thru all the headaches and deadends I just did.
Anyway, your reply was still appreciated.
Dan