Separate multiple faces UV I can separate single faces in the UV editing mode. I disabled sync selection and sticky vertex selection. But when I select two faces in a group of joined faces, I can't separate them by pressing Y. I have blender 2.74.

How can I split a group of joined faces in the UV mode?
Hit the G key to move those faces.

After spliting the faces. You would be required to move it. The split operation does not automatically move the selected uv for you.