Hi,
Something could have happened in Maya Prefs.Try reseting Maya to the defualt settings.
Steps are:
1. Locate the Prefs folder in Documents - C:\Users\user\Documents\maya\2019.
2. To back up the existing preferences, rename the Prefs folder to OldPrefs.
3. Unistall the ProRender plug-in and reinstall it.
In most cases, this should fix this issue. Also try the beta build see if this happens on this as well. https://community.amd.com/docs/DOC-2090