Problem using alt click to hide other layers
A nice feature of photoshop is the ability to alt-click the eye on a given layer so that all other layers are hidden. Alt-click again, and they are again revealed. I have a file in which that feature stopped working. I can take any layer or subset of layers, duplicate them into a new document, and the feature will work perfectly with those layers in that new document. I tried resetting preferences, but that didn't fix the problem. If I alt-click the eye on any layer in that file (but only in that file) the action produces no result. Does anyone have any idea what might be causing this?
