I am running Parallels 13. I have configured Parallels for Manual Startup, and when shutting down my Mac, I have not checked the reopen windows upon startup button. I only use Parallels to run Quicken, which I don't use every day. Running the Virtual Machine slows my computer down to a crawl, so I only open it when I need it. This is a recent phenomenon, it hasn't always worked this way. I have also tried a Custom Configuration with "Never" selected as the Start Automatically option, but it just doesn't work.