- Okay. So this has happened on several occasions with different assemblies on two different computers running SW2013 x64 sp2.0. The problem we are having is when creating a virtual sub assembly using the "Form new sub-assembly here" button. After selecting a few assemblies I click the "Form new sub-assembly here" button, and then I click "Save assembly (in External file)". After changing the name to what I want it to be and click "OK" SW crashes, every time. Now a work around for me is to create a new virtual sub-assembly, then rename it, then drag and drop the assemblies into that new sub assembly created. Is anyone else having this issue? If so is there another fix that I do not know about?