The issue might be caused by a slow internet connection, as the overall connection speed and performance are only as good as the slowest network segment between Viewer and Host. I have just tried connecting from mobile Viewer on the iOS device to the Host machine with the Color Depth settings set to different values - every value works perfectly fine on a good internet connection.
Could you please let me know if you use the Internet-ID connection method or Direct connection? If you already use Direct connection, please try enabling the Use legacy capture mode feature and see if it helps to resolve the issue. To enable the feature please do the following: 1. Right-click the Host icon in the system tray and select Settings for Host. 2. Navigate to the Other tab and enable the Use legacy capture mode checkbox. 3. Right-click on the Host icon and select Restart Host or simply restart the Host PC.