I am running Storyline under Parallels on a MAC OS High Sierra. Storyline opens and runs great under Parallels. However, when I try to quit/close the software it doesn't quit. I always have to open the windows task manager (ctrl+alt+del) and close it manually.
This is the only software running under Parallels that causes this problem. (For example I am running "Flipping Book Publisher" in the same way, and I can quit it no problem.)