BPWMorro wrote:
I have a MBPro 16" with an AMD Radeon Pro 5500M 4GB running Big Sur 11.6. When opening .png files (most often created as screenshots) or .jpg files (taken with my iPhone and air-dropped to the MBPro) I have a flash red light obscuring central portions of the image. It usually goes away but sometimes not. It is also a significant problem when opening a Google Earth screen through Safari. Any thoughts? Suggestions on how to test the quality of the video card? Thanks....
To trouble shoot further you can:
—Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.
Login and test. Reboot as normal and test. Caches get rebuilt automatically.
In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
—Test issue in another user (or guest user) account https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac
This will tell you if it a universal issue or isolated to your user/admin account.
Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus
all known to cause issues on the macOS
If no insight or resolve you can always reinstall the macOS on top of the existing macOS to sort anomalies;
How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904
