Why are the Colors Displayed as Grayscale

Typically we see this happen when the users change the Accessibility Options.  These options are there to override document colors for color impaired users.  If your colors and markups in the PDF are not displaying properly please make sure that you have NOT checked the "Override Document Colors' in the Edit > Preferences > Accessibility Options.

 

 

 

 

The other thing that might cause it would be if there is a conflict with the display driver color profile.  Under the Edit > Preferences > Color Management if the Working Space RGB color is set to the monitor color profile you can try changing it to the default which is sRGB IEC61966-2.1.