When I expand a selection or move and image/object around then deselect the edges/parts that end up falling outside of the canvas area get deleted. How do I stop this? When I go move the layer around or resize it I can't because what ever parts landed outside of the canvas area have been deleted. This is on Photoshop CS6, I never had this problem with CS5.
Make the Crop Tool active and turn off [ ] Delete Cropped Pixels in the options area.