System Information

OSX. Ver: 10.9.3 (13D65) (i haven´t try this on any other OS nor Diferen PC)

Prossesor: 2.7 GHz Intel core i5
Mem: 8 GB 1600 MHz DDR3

Graphic:

NVIDIA GeoForce GT 640M 512 MB

Blender Version

Broken: 2.7.1 Release candidate

Worked: 2.70

Crash

Single bones Meta Rig (addon)

Extruding (crashes always) Resizing (crases sometimes)
Creating/resizing/rotatin etc(Worked) Changing Pose (crashes always)

Exact steps for others to reproduce the error (Not Really shure what blender file (nor if i have to) attach here so..)

-->Just open blender 2.7.1 (release candidate)

-->Shif+A for adding (3buttons+numpad emulate enable) a single bone or Meta-rig (with the addon enabled)

--> go to edit mode

(for single bones)

--> press E for extruding and try to, the system will crash

(for Meta Rig. Althoug i think this add on crashes due to the bug with the single one bone)

--> Same here, open a new project, then add a Meta-rig
--> Go to edict mode and try to change its pose (it will crash)