I am unable to view any pdfs with Adobe Acrobat Reader DC on my Mac.  The menu bar shows the file is open (file shows up when click on Windows in the menu bar).  When I right-click on the Reader icon in the Dock and select "show All Windows", my desktop is cleared of all other open programs and I see the open file name and a slice of an icon above the filename.  I can not click to open, enlarge it, etc.  This may be a Mac settings issue vs a Reader issue but either way, I can't figure it out.  I can open the file with Mac's Preview, but I lose not reader.  Thoughts to address? ... View more