**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)