This plugin comes with it’s own template file (gallery-template) and that one does not work well in Simple Corp.
First you should copy file gallery-template from your plugin into main SimpleCorp folder.
After that you should create a new page, and select the gallery template on the right. That page will display all your gallery’s.
But this template does not work well in SimpleCorp. So the template file should be adjusted.. Do you want gallery with or without sidebar?
Wppa (http://wordpress.org/plugins/wp-photo-album-plus/) seems broken now in my website, my template look messed up.
I’ve the author note about possibilty of wppa to conflict with other plugin like shortcode ultimate, google analytic, tinyMCE. And I’ve do what the author order about that plugin but the problem is not resolved.