[dba-Tech] A PowerPoint question on timing slides

I'm working on a presentation that is self-running. However, I want a viewer 
to be able to click and advance slides at will as well. In the Advance Slide 
setting in the Slide Transition Task Pane, I've checked both On Mouse Click 
and Automatically After -- and applied a time setting for the latter.

To me, that should do both -- advance automatically while also advancing if 
the mouse is clicked. However, it ignores the mouse.

Is there a setting someplace that inhibits this setting?

Susan H.