This always happens when I select "separate connected surfaces" from my model. I used Meshmixer to generate my supports for my model and imported the .stl file into S3D to print. The initial issue I was having was S3D was adding gaps into these supports, when looking online they said "separate connected surfaces" would fix it but S3D just craps itself as soon as I press the option. No progress bar, nothing. Any suggestions?
Please disregard this post. I found out what was wrong. If anyone else is having this issue, S3D is still running, Windows just things it has stopped. Let it sit for a while and it will continue.