I have downloaded the latest 64-bit Installer ( Phidget22-x64_126.96.36.19980508.exe ) and installed it.
When I double click the small icon ( that shows when hovered: Phidgets22 Control Panel - Network Server is Stopped ) in the taskbar or open the Phidget Control Panel in Start menu of Windows the normal(big) App icon is shown in the taskbar but its window doesn't show up. But the window is shown when I hold the Alt + Tab keys to switch between windows and also when I hover the big App icon it shows a small preview.
When I click the big icon in the taskbar the icon just disappears and the preview of the window is also gone.
TL;DR -> SOLUTION:
I use a normal user account on my Windows 10 PC and only use my admin account to install Apps.
When I exit the running Phidgets Control Panel and then use "Run as administrator" to restart it the Control Panel works just fine.
Hope this helps.