In CS6, full screen mode, the image keeps moving up, down or to the side if my cursor gets too close to the edge of the screen. sometimes I'm not even at the edge of the screen but in the middle of the screen, I move the cursor right, the document goes to the left. In the old days the window stayed put unless you used the handtool to move it around. Is it possible to go back to this mode? I don't ever want my image to move unless I specifically ask it to.
What operating system and version?
Are you saying document moves just by moving the cursor without a mouse button pressed or any keys pressed?
Are you using a trackpad or tablet that lets gestures be enabled?
Somehow I suspect you have a display driver mode enabled that makes a virtual desktop that's bigger than your actual monitor.
Check your display driver settings and disable any of that nonsense.