**System Information**
OS 10.8.5
GeForce GTX 570 1280 MB x2
**Blender Version**
Broken: 2.69 b53f310
Worked: ????
**Short description of error**
location: <unknown location>:-1
RuntimeError: class WM_OT_enhanced_3d_cursor_registration, function modal: incompatible return value , str(, Function.result expected a set, not a NoneType)
**Exact steps for others to reproduce the error**
I activated the Enhanced 3D Cursor add-on in an empty default .blend file, made it default, opened Blender again, and received the above error.