I can load an mp4 into the editor but can't do anything else. Can't play, edit, move, go forward or backward, save, ... nothing except open momentarily. Crashes whenever I click on anything. I've spent the last several hours trying everything, including installing the latest update. Tried the CTRL Shift method explained in a different thread to reset. Bought Vegas Movie Studio 17 Platinum in March 2021, worked fine until the last two updates. I have Windows 10, and my computer meets or exceeds recommended specs. Please help!