Membership Plugin will not save setting changes.

I have installed the Membership plugin as prescribed by the PDF documentation.

I have set up three levels so far.
The issue that I am having is, every time i attempt to save a setting change by hitting the "save settings" button at the bottom I am redirected to a page asking "Are you sure you want to do this?" and the Tab on the window reads "Fail". On this page, there is no option to select yes or no for the question I asked.

I am using the plugin on a multi-site install. the plugin is not network activated. I am the admin.

Thank you