**System Information**
openSUSE 12.3 64bits
NVIDIA 480GTX SC
**Blender Version**
Broken: Blender 2.69.10 3b71cab
**Short description of error**
Anisotropic rotation for the background material changes from vertical (correct) to diagonal in some frames
**Exact steps for others to reproduce the error**
Render animation on {F73589}
At some point, hopefully in the first 10 frames, the background anisotropic reflection will change