I just bought the pro version, installed everything as directed. When I go to add slides to a new slider, the "add slides" button does nothing.
"/wp-admin/admin.php?page=metaslider#" - this is what shows in the url field in my browser.
Also, I only see the free version's 4 slider types. None of the pro version types are visible.
I am running windows 7 and tested in both Firefox & Chrome (latest of both).
I also disabled all other plugins in case there was a conflict and that didn't fix the issues.