Normally a selected item in Xcode's Project Navigator is indicated by a blue bar behind the item. However, sometimes for no apparent reason this changes to white text with a kind of very light blue drop shadow and no background color change. Does anyone know why this occurs or how to prevent it? To fix it I always just have to restart Xcode.
I'm using Xcode 7.2.1 (7C1002) on an OSX El Capitan 10.11.3 machine.