The only thing I can think of is to relink.
(On a side note, this is why you don't upgrade things in the middle of a project. 20/20 hindsight, huh?)
Will give it a shot. Pardon my stupididy, but where would that be? I just looked and can't find "relink."
Still coming out of the fog that was 10 years in FCP I suppose.
And I agree with you - I never upgrade in the middle of a project. Never ever ever. This was a case of a project that had been delivered and was thought to be done coming back for more stuff. In a sense it's great, but if you've seen my other posts on here you know that the Lion upgrade has gone less than smoothly, as far as PPro goes.
Try selecting all the offline comps, and then execute a Relink command (access via Cmd/right-click). Assuming they're all in the same AE project--the Relink command asks for the project, not a comp--they should automatically all relink when you select the project.
(At least, that's how I remember it working.)