Cannot Install Plugins from the WPMU DEV Dashboard

I've just installed the WPMU DEV Dashboard to get started redoing my site. Here is what it looks like when I click on the install button to try and install plugins: http://squigglymarketing.com/wp-content/uploads/2015/11/Screen-Shot-2015-11-09-at-10.48.10-PM.png. And sometimes I have to login to the plugin multiple times.

Thanks for your help.