Found it!
I am using the TablePress plug-in (Version 1.4 By Tobias B?thge). My shortcode to launch the Album is in a TablePress cell. If the Album shortcode is moved to a standard page, the issue described in this post goes away. I don’t know the details, but I do know that TablePress does have some security related features. Those features must be affecting WPPA querystrings when WPPA shortcode is embedded in a TablePress Cell. I will let Tobias know.
Thanks very much for your reply. Your advice was good.