Stuck on the Screen

I had written a nice song, and I went to save it, and it froze up. I left the computer on and went away until late afternoon. It was still frozen. So I had to get off of the composition and helplessly watch the song delete. When I went to exit the program for good, it wouldn't turn off. It has now currently done that for two days and now playback is not working correctly. I can open it up again if I click on the app but it won't turn off the already existing screen. The screen I had just pulled up worked and turned off after I saved everything, but not the other one. Now I have this unfortunate screen that keeps freezing up and blocking my background picture. Has this happened to anyone else? It's such a good program. I don't want to have to delete it off my laptop and find another free program. If you have any tips, opinions, or comments PLEASE feel free to answer back. I would love to know if anyone else is having this trouble. I am an aspiring music writer, and to have this inconvenience so early is not very fun. MuseScore is fun. I don't want to have a reason to dislike it.