Directory plugin is breaking the backend GUI of my Yootheme WidgetKit when activated

I am trying to setup a searchable directory of member organizations for an association. I was able to install and setup the Directory plugin, combined with CustomPress, yet when I activate the Directory plugin, it messes up the settings section for adding new Yootheme WidgetKit plugin items. The CustomPress plugin activated alone still allowed the WidgetKit to operate correctly.

Additionally, I will be using several Yootheme templates, which do not have a 'single.php' post template that I can use to replicate and edit to customize the frontend display items of the Directory listings. Where is the Directory/CustomPress plugins looking to find the 'single.php' post template file? Thanks!