P: Image Resize Distorts / Corrupts File on M1 MAX macs

Good to hear!

PROBLEM SOLVED.....well, sort of.

Very good observation. GPU Acceleration (or "Use Graphics Processor") was turned on when the problem occurred.

I just finished with Adobe Tech Support. They were very expedient and helpful.

Their solution to solve the problem (glitch), is to turn OFF "Use Graphics Processor" in Preferences>Performance, and then pump up the % of RAM used by Photoshop (in the same Preferences>Performance window) to 80% or better. I then resized the image (it was a large file, so with Graphics Processor off, it took forever) and it worked. No more corruption of the image.  When it was done, I put my Performance settings back to where they normally are (ie. turn on "Use Graphics Process" and put RAM down to about 70%)

So, I don't think it's totally Monterey's fault as I was successfully able to complete this process on a MacBook Pro with the M1 PRO chip. Where it failed was on the MacBook Pro with the M1 MAX chip. Go figure, the more powerful processor doesn't work.  The M1 Max has more graphics cores than the M1 PRO, so maybe there's something there that PS can't manage. I'm just guessing that's where the problem is.

Thanks for the help.

Well, that's a new one.

I'm going to point my finger at Monterey 12.3. There has been no end to new problems since it was released.

I'll ask the usual first question: Does it happen whether GPU Acceleration is turned on or off?