This is happening on several occasions. When Photoshop is about 20% into the render, there is no turning back. I've tried ESC and there is nothing that will stop it. Unless I Force Quit - The only option..... unless I wait for the render to finish completely.
I'm running a MacBook Pro Retina i7 8 GB Ram.
If this is hardware related, are there any Preference setting to help prevent this problem?