I'm having a problem with the link button in the visual editor not functioning/displaying properly in WordPress 3.9.1 due to this plugin.
I've tracked down the error that I'm having. It's due to line 227 of dudaStyle.css (the line that sets form elements to display:inline). I commented that line out and it seems to have fixed my issue with the link dialog box displaying improperly.
I've replicated this same problem on 2 separate installations.
Just wanted to give a heads up to the plugin developer who will hopefully release a fix.