EDIT I noticed sometimes the service DAZ Content manager doesn't start, when it doesn't (like after I changed my item below and restarted DS4), then no content seemed to come up, nothing to click on.  click on the start menu and type in services and see if daz content manager is 'started' if not right click and say start. then rerun ds4 and see if things work any better.  END EDIT

 

Also try this in case its corrupted.  Go to the Window menu, then workspace, then layout.  What comes up for me by default is Hollywood Blvd, check to see if thats what it is.  Try selecting something else and see if that has any effect.