I'm using Unity 4.6.9 and exporting a Mac OS X build with Display Resolution Dialog set to "Hidden By Default", however it does not seem to be working on my two test machines (Macbook Pros from 2008 & 2012, both running El Capitan). Is this a bug with El Capitan or possibly something with Unity 4.6.9? I do recall this working for us on a Snow Leopard machine with a build from Unity 4.3 a while ago. Selecting 'Only show this dialog if the option key is down' does seem to work. Thanks!!