Things go haywire only when exported

[Jkoseattle]

I have a movie which consists entirely of imported images appearing and disappearing and moving around etc. sometimes I am moving the camera (pan and zoom) and sometimes I'm moving the images themselves, depending on the need. Looks great, all done, time to export!

But when I export, there's a certain spot where images move around not where they were designed to. This appears to be related to camera movements, as the problem starts right when there are zoom and pan keyframes. Later in the movie it corrects itself, but for a while in the middle, everything is all off. The bizarre thing is this only manifests in the exported video, and not when I play back in the timeline.

I'm confounded. My first attempt to fix was to delete the zoom and pan keyframes that occur right when the problem starts, and replace them with new keyframes. That didn't fix it.

(Also, and I don't know if this is relevant, but for a long time now, like a couple years, moving the camera zoom does not generate a keyframe at all. I need to go to the zoom camera lane in the timeline and manually add the keyframe. This only happens with zoom.)

[Jkoseattle]

A little more info:

Limiting the render to just the section with the problem (rather than Frame 0-END) still exhibits the problem
Preview animation does not exhibit the problem.
Muting the camera tracks solves the problem.

[Jkoseattle]

ANSWER FOUND:

Nothing to do with the camera.

The background image had some Transform keyframes, and those channels were muted at some point, and obviously I did without them because I forgot they were there and muted. But muted channels render when exporting if the Render muted channels option is checked, something I've never noticed before. So I removed those channels from that layer and now it exports fine.

So, never mind I guess!