Cannot 'see' the color palette window

I am unable to view the color palette after selecting any of the icons that bring up the color palette window. This has occurred while I was using DS 2020 and now DS2021. The laptop acts as though the window is visible as the program seems to be waiting for a color selection, but since I cannot see the window my only option is to ESC out of the command. I can manually enter -LineColor and enter an RGB code to select additional colors. Any suggestions would be appreciated.