4.0 Does not open previous models upon restart as 3.1 did. Is that intended? For example I load 2 models for slicing, close the software and reopen. The previous 2 models are not open as was in 3.1.
It works fine for me. It still reloads all of my old models just like it did before. You might want to go to Tools > Options (or Simplify3D > Preferences if you're using macOS) and make sure that "Save and restore application state" is enabled.