System Information
Windows 7 64bit

Blender Version
Broken: official 2.72 release and also 2.72 4d4d2a31

Short description of error
In texture painting mode, on 3d viewport, the "normal" option is working weirdly: brush strokes are sometimes not "showing up/ working" even when supposed to be working, especially when painting close up to the mesh.

Exact steps for others to reproduce the error
Add a cube or other mesh, uv unwrap it, assign a texture and go to texture paint mode.
Start painting/brushing with the default brush and move, rotate, zoom in the object being painted.
When view is close to the object paint strokes stops to work even if the angle towards the view is below the "normal option" treshold; they sometimes resume to work if the view is modified.
When disabling that option brush strokes are working correctly.