Just installed Hustle and after selecting the "create pop-up" option from the plug-in dash, none of the entry fields or buttons work (including content area updating, image browse, and save/cancel/next buttons).
When I leave the pop-up creation page, I'm taken to an error page that says "Sorry, you are not allowed to access this page."
Not sure if this is public-facing, so not including site-url. I assume you can get this from my hub. Support access has been granted in the WPMU Dev section of the site.