**System Information**
Windows 8.1, AMD FirePro m4100
**Blender Version**
Broken: blender buildbot 2015-08-26
Worked: n/a
If you set your subdiv surface to opensubdiv and then try to center the object, it will center with a vertical offset. If you switch the subdiv modifier back to the old method then it will center fine.
**Exact steps for others to reproduce the error**
Make a box, set it to opensubdiv and hit <numpad .>