OS: win 7 home premium 32 bit
Graphic card: AMD Radeon HD 7310M
Broken: Blender 2.69.0
Short description of error
I have a blender file setup, its a tube with 2 bones, bend the bone and the shapekey deforms the mesh.
In the graph editor, im using the driver variable Rotational Difference.
Its the difference between the 2 bones 'a' and 'b'.
It works, but the driver variable property 'Armature' on 'Bone 2', the property is red, i dont know why.
Exact steps for others to reproduce the error
Graph Editor: Drivers: Properties: Drivers: Rotational Difference variable.