Customers accessing their own or Pellcomp hosted copies of PICS using the Windows 10 Remote Desktop client may be experiencing problems with pop-up windows failing to appear until you click away from PICS and then back again.
The issue originated with Windows 10 – 1803 (April 2018 Update). Earlier this week Microsoft released hotfix KB4284848 which …
“Addresses issues with the Remote Desktop client in which pop-up windows and drop-down menus don’t appear and right-clicking doesn’t work properly. These issues occur when using remote applications.”
More details about the patch and how to aquire it can be found on the Microsoft website