Thanks for the fast reply Oshyan!
Disabling the 3D and Object preview windows allowed me to import both .TGO and .OBJ objects, however when I go to open the 3D preview again, it crashes.
After importing, but before re-enabling 3D view, I've even tried disabling the object, changing it to "hidden", and disabling the sub-object shaders, but am getting the same crash when trying to preview via 3D or Object views.
It also seems, with the 3D and Object preview windows closed, I am even able to render a scene with the imported objects. Meaning it is able to read the file + textures without issue, and seems to only crash when displaying to the preview windows.
Perhaps you can try importing one of the files that I'm trying to use, to see if you get any similar issue? Maybe my file is out-of-date and I just don't know it.
Thanks!