When I return to a previouse Layer and attempt to alter the Layer I receive the same Error "Could not use Blah Blah because the target channel is hidden. This happens with Erasure, Selection too;, Move tool, Pencil, Paintbrush and so on. What is happening and what do I do to fix it?
Are the composite Channels selected (Red, Green and Blue for RGB, Cyan, Magenty, Yellow and Black for CMYK etc.)?
Could you please post a screenshot with the pertinent Panels visible?