This plugin has caused two unusual issues on my site:
1. Prior to WP 3.9: it caused issues in Appearances > Menus (adding a new menu item resulted in the spinner going on infinitely and the page/link not being added to the menu).
2. After upgrading to 3.9 (and then 3.9.1) it cased a white screen of death.
My first thought was a plugin conflict, so I disabled all plugins except for Types but I still had the WSoD. The only thing that seemed like it might conflict is the Menu Items Visibility plugin, but this works fine with all prior plugins except Types. Anyone else having issues?