Hello,
Sorry to hear you are having issues. I have forwarded your problem to Stardock Support team for their assistance. Please keep an eye on this thread for any updates. We appreciate your feedback and patience.
Note : The "Win+Arrow up+ left or right" problem can be solve by using Groupy tabs in "Combine if possible" mode. For me the problem only appear if the tabs "Always place above" mode.
Basj
Stardock Community Assistant.