Windows 7 Professional 64-bit - Service Pack 1
ASUS nVidia GeForce GTX 760 2GB GDDR5 DirectCU Mini
Broken: 2.69 hash: f469cbe - also broken in official 2.69 r60995
Viewport is set to orthgraphic view. Camera is also set to orthographic.
When toggling between the two using keypad '0' the viewport needlessly switches from an ortho view into a perspective view and only then into the desired orthographic camera view.
See attached file.