**System Information**
Linux Mint, GeForce G 103 M
**Blender Version**
Broken: cf01f2c
Worked: f93bc76 (official 2.70a)
One of the bones in a simple rig I'm working on has disappeared. Anything parented to the bone also disappears.
In the attached file, the bone is selected (bone1) but not visible. Moving the bone around makes it flicker into view. When it is visible, the roll switches to 60 degrees, when it is invisible it flips back to 0.
Create a cube and parent it to any bone in the armature. It disappears.{F84967}