OSX 10.6.8 Ati Radeon HD 2400
Broken: 2.76 (6158a98) Blender buildbot and official 2.76 +2.75 releases
If i Unwrap model with "use subdivision modifier" on, it gives unexpected results(single faces are unwrapped
I uploaded also a example blend file : Unwrap the mesh and turn "use sudivision mod."on.