Are you unable to re-link in the normal way? — In the project window, right click on the offline Dynamic Linked AE comp, then select the appropriate After Effects project.
For me (in CS5.5), Dynamic Linking is not worth it. It slows down performance and can cause all sorts of problems.
If I need to work a specific PP clip in AE, here is the only way I use Dynamic Linking now: I will ‘Replace with After Effects composition’. That sends the clip to AE with the right In & Out points, linked to the correct original media. Then I immediately undo that action in PP so the original clip remains in my sequence. Then after I am finished working the clip in AE, I export a DNxHD file and import it into PP.
John
John Young
Surrounding Media