Looking at in Paperspace. However, when I switch to Modelspace, the only thing there is the titleblock. This was brought in to PM as a .pmk, so not sure why this one shows up where the others do not.
I set the maxactmv to "20" . It was set to "16", at most I might have 8-10 .pmks brought into a layout. A couple of drawings only 2 or 3 .pmks.
One thing that I have remembered, but can't recall if it happened in all cases, is the .dwgs that seem to have the viewports empty, are where changes were made in the original .pln and the .pmk files were updated.
As I said earlier, originals done in ArchiCAD 7.0 and now using 8.0.