I just installed OR. On "Optin Popup 1", the scroll bar appears and then disappears. I try to delete, add or edit content, without response. I've tried deactivating some minor plugins and saw no resolve. I use "Sliding Doors" theme. I feel it is a conflict with another plugin, but on a busy board, I'm unable to disable all plugins to test. If I enable the popup, the default popup will appear.
The propblem remains only within the admin portion of the plugin.