ah ! that explains it then.
You need to check the FPE file for where the textures are for those that show up white you might also need to change the texture format for example jpeg to DDS
those that do not show up you might need to create a FPE file for them and the ones that crash the editor has problems with the FPE file or the FPSC doesn't like the entity.
The are numerous utilities here that will allow you to make new FPE files for entities should not want to edit them....
"In my weird politically incorrect hypothetically incoherent contradicting obscured world definitively maybe"