Do not try switching between layout and router.
First try and save the file off in router as another name and try opening that new filename in Pads layout.
Or can you try just saving the pads router design with the same name and try opening in Pads layout.
We tried all off this. Unfortunately nothing is working
I just sent an email to what I believe is your email address. Do you work at Addiande?
Mentor Graphics Customer Support