Hello,
Sorry to hear you are having issues. Please try, uninstall Multiplicity 4 pro, reboot immediately (important), download latest version available in your account product download page: https://store.stardock.com/myaccount/products . Install it, reboot immediately again. Repeat on all other Systems that will be connected. Retest it and report back.
Thank you,
Basj,
Stardock Community Assistant.