actually i had groupy disabled...issue remains. (rebooted as well)
I am just wondering.
1. What will happen if you press just windows key without anything else?
2. Your problem to all program ie. windows explorer, Excel, browser? or specific program?
3. What is the hotkey setting in groupy? Groupy setting -> Settings -> Configure Hotkey? If its set to default. Try disable the "Enable hotkeys to switch between tabs in a group"