Use of GPU suddenly produces inaccurate image rendering. Why? and what might resolve this?

Images that display accurately in Bridge, Camera RAW, LRC Library & Develop Modules, Preview, etc., are rendered completely washed out in PS regardless of whether or not edits have been applied. This occurs in both PS Beta (v27.10) and PS (v27.9). Finally narrowed it down to use of the GPU. When Use GPU is UNchecked in Settings>Performance, the problem disappears. I’ve had that option turned on essentially since it became available, so something has changed (or failed). There are advantages to having the GPU use turned on that I would like to retain. Any insight as to why this is happening and what might be done about it will be sincerely appreciated. Thanks.

Details: Mac Mini M1/OS Tahoe 26.5.2/ PS Beta v27.10/PS v27.9