Earlier today my Quick Mask Mode (which I use a lot) in Photoshop stopped working completely. I’m not sure what happened to cause this, but I had to have it in order to complete the project I was working on. It’s my favorite masking method! After some poking around I suspected a bad preferences file to be the culprit.
Here’s a trick to have Photoshop delete and create a new preferences file on start up.
Restart Photoshop and press and hold (while Photoshop starts back up):
Mac: Shift+Option+Command
Windows: Shift+Alt+Ctrl
A pop-window will appear asking you to Delete the Photoshop Settings file. Click Yes.

That’s it! It fixed my Quick Mask Mode issue… now I’m back to quick masking!
Note: Creating a new preferences file will revert your palette arrangement and any saved preferences back to Photoshop’s default. Small price to pay to fix a troubled Photoshop, though.
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Thanks! This really helped a lot! I was cutting and pasting from Illustrator to Photoshop and suddenly the edges lost their anti-alias. I tried re-starting but it didn’ work but your tip did!
There is obviously a lot to know about this. I think you made some good points in Features also.
Thank you! your information solved my photoshop problem. Oh-man i had to uninstall and re-install two times but still wasn’t working!
Thank you for the million dollar information!!!
Jay
THANKS A TRILLION!! I thought I was going to have to give up my favorite tool!