I have been having a problem with Power Music Pro ver. 5.1, in that when I click in to open another window with the program(I.e. Power Store pop-up) it stays in the background. When I use Alt-Tab I see it open but can’t choose it. Not sure if the is a Power Music Pro issue or a windows 10 issue…
Can I start by asking - are you using Tablet Mode on your device? If so change to Desktop Mode and try again. Power Music works best in Desktop Mode.
To change mode go to Start/Settings/System/Tablet mode