System Information
Win 7 / Quadro 2000

Blender Version
Broken: 029de80
Worked: (optional)

Short description of error
Trying to do a 'thickness' Shift + Click measurement in ortho view crashes blender
works in perspective

Exact steps for others to reproduce the error
1.Factory default .blend
2.Ruler/Protractor
3.Shift click on cube - works as expected
4.Switch to Ortho view
5.Shift measure thickness- crashes blender