I added the widget and this initially showed a message saying there were no quotes. It took AGES to find where to add quotes. The instructions say: Adds section under Manage tab to create and edit content.
There is no 'Manage' tab. The quotes are added under Posts.
I added some OK. If you add an author, you get the 'insufficient permissions' message.
I visited the plugin site, but this seems to be for a different plugin altogether.
This would be a great little plugin if these niggles ironed out!