After the latest update of PS (2021), I go to set my white and black point, only to discover that it has changed from being black to a horrible lime-green color. It also appears to be bold, instead of normal. I have reset my tools, but to no avail.
I chatted with someone earlier tonight at Adobe and after much troubleshooting, it was determined to be a corrupted file that apparently occured during the update. Since it worked perfectly before, and the problem only appeared after the update.
If this happens to anyone else, you'll need to chat with Adobe and they will run you through the screen sharing steps so they can troubleshoot the problem and resolve it.
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