candyK

It's happens with every new photo, not old ones.

Forgot to insert from questionnaire: I have a PC desktop running Windows 7 Professional and Photoshop CC2017. It is under 2 years old, and has 32GB of RAM. Its hard drive has 78.3GB free out of 223GB. The last time I shut down was just before posting this thread. I have never run a cleanup program.

Thank you so much for your quick response, Damien, however, solution A and B was unsuccessful. Updated Camera Raw, deinstalled PS CC2017 and reinstalled. Also ran a disc cleanup and ran an update for Nvidia Graphics card. Unchecked the graphics processor box, closed out of PS and shut down PC, restarted but when I tried to open ACR, I received this error message: "could not complete your request because the file format module cannot parse the file" Attaching screenshot of ACR glitch from a random photo...

Just thought I should clarify --Lower left corner of image breaks up into a square, checkerboard of sort. I am seriously freaking out!!

Hi Damien, Experiencing something very odd tonite. Working on raw edit in ACR and as I adjust the sliders I am getting a square transparent square (sometimes turns black) in lower right corner of image. I am operating Windows 7 Professional and Nvidia GeForce GTX 750ti graphics card. I have rebooted my PC a couple of times but still continues. Any ideas why this is happening and how do I fix this?