Is there a problem with Adjust 5 exported from LR and then returned to LR?
Made a DNG file in LR from 2 JPGs as a panorama
EDIT in Adjust 5
The image is returned to LR but when you export the file out of LR it is totally blank except for the copyright which is applied in LR
BUT if you
Edit in Fusion Express 2
Select Adjust 4 as the process method
The image is returned to LR and is then sound when you export the file out of LR