Do you have videowall mode enabled?
Can you please send us the following for further analysis:
– dxdiag.txt file – just run dxdiag.exe on your primary machine, click “Save All Information”.
– screenshot of your viewer showing the “old fashion 16 colors”.
We have received the request files.
The color issue is due to AMD’s 10-Bit Pixel Format enabled in the settings.
Please disable it, just open the Radeon Software window, click the Settings icon on the top right side, then “Graphics” -> “Advanced” -> disable the “10-bit Pixel Format” then reboot your primary machine to apply the changes.