If you have failed to retain your Mosaic Wizard target image used for a multi-panel project is there a way to re-generate the image from the list of targets?
Not really, but kind of… The closest you could get would be to use one of the frames for the center-ish panel as the basis for the canvas search. That would yield a canvas with the center frame outlined in blue and allow you to redraw the other frames such that the “new” center frame overlaps perfectly with the old. Then export the sequence and use that one (saving the working image) or just take a screenshot, save it to disk and add the sequence file to the sequence manually.
Thanks Ken!
I kind of thought that, just hoped there was a short cut 
Sorry for delay in recognizing your efforts/ response.