If you are using the short code to display the galleries you need to set the “count” to display more galleries and the title issue have been fixed on 3.1.1.
If you are using the taxonomy template (and you should) you can control the number of galleries in the setting > general.
activating and deactivating the plugin will do remove previous you need to go to reset > uninstall to fully remove the plugin and installing the plugin will recreate all the pages for you “secure images”, “image store” and “cart”.
You can use any page also to replace the ones mentioned above by using the dynamic shortcode