I know this is a topic that has been covered before, but I'm still having problems and I 'm not technical savvy. I'm using Movie Edit Pro Premium 2020 on a Dell computer, windows 10. The playback is incredibly shaky. It has never not been shaky since I downloaded the program 3 weeks ago. The program is up to date, there's nothing playing in the background, generating proxy files is checked, the lightening bolt is turned on with everything checked... no change