**System Information**
OS - Mac yosemite
**Blender Version**
Broken: 2.72b
Worked: (optional)
**Short description of error**
**Exact steps for others to reproduce the error**
Based on a (as simple as possible) attached .blend file with minimum amount of steps
when i'm animating in keyframes, I copy my poses, and mirror them, and when i do it doesn't properly mirror them over.
before i mirror over
http://i.imgur.com/nXhESt8.png
and after
http://i.imgur.com/NOLeNBV.png