"Locked by another process"
I was working on a Storyline 3 project when it quit working. When I tried to open it again, an Articulate Storyline pop-up window came up that said: "The project "Storyline" is locked by another process." (That was not the name of my project, though.)
I restarted my computer twice and I can open other Storyline projects. I don't want to lose all the work in this project.