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I used to be able to clone stamp from a different image than the one I was working on.  while using clone stamp I could hover over another image on the desktop, press the alt key and click, and then continue to clone the main image.   I double check that the layer in question is selected etc. but I just get a sort of no access symbol, a circle with a diagonal line across.  I can clone okay within the same image but not from a remote one as I could before.  any ideas anyone...