After I installed evince, I noticed that it is no longer possible to click to a pdf file from filemanager and open with evince. Actually, evince starts, but it does not open a file. Worse yet: When I click to a pdf file in opera, evince starts up with an empty screen too. I tried to deinstall evince, and then the everything works fine with the built-in pdf-reader. Installing evince again shows the same misbehavior. I tried to find the place where the commands for opening a file from filemanager or opera are actually stored. Didn't get an solution. Maybe a mime-problem. Any hints?