I had exactly the same problems with Poser 5 and Poser 6 and now I always switch off external binary morphs.  I am now using Poser 2012 and a lot of people say there have been a number of changes in this area but I have never wanted to find out.  Files are larger but storage is cheap so I am sticking with what I know works.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.