When i make a mask of any type, the subject is highlighted in red, per my settings. However, the part of the image selected turns black and white and stays that way regardless of the overlay mode. Any suggestions? Thanks.
Try resetting the preferences of Lightroom Classic: How to reset Lightroom Classic preferences (adobe.com)
It's recommended to backup your preferences before you reset the preferences to the default settings:
https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html
If this doesn't help you should try to switch off the GPU support from the Lightroom preferences and check if that helps to fix the issue.
Go to Lightroom > Preferences > Performance tab > Uncheck "Use Graphics Processor" > Restart Lightroom.
https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html
If it's help see here Troubleshoot GPU issues | Lightroom Classic (adobe.com) and check the different steps.
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