After the udpate to 3.6, anytime I go to my site's login (/wp-admin), I just get a blank white screen. No errors appear in my web server log. I haven't checked the php log yet, but I'm not sure I'm even logging that.
I reverted to the previous version of the plugin and everything is working again. I should also mention that this is a multisite/network installation of WordPress 3.8.1 in case that matters. The plugin is not network activated, only installed on the network and activated on a site-by-site, as needed, basis.