Updates:

Strangely I did manage to temporarily fix it before attempting that during the process of making sure I had a backup copy of my project file per your advice. I noticed I had a previous project and, on a whim, I ended up opening it to see if the texture issue was there as well. It was not ...

I have been working on a blueprint for some time. I imported some new 3D models from the site and used them without issue. Then, after restarting my computer one day and reopening SW3D, every single object in the 2D view has the same texture! Strangely, it looks correct in the 3D view. The models ...