In an armature using custom bone shapes, having a custom shape with wireframe enabled/disabled affects the thickness of other custom bone shapes' wireframes by 1 px.
I have attatched a .blend file
In the file, a bone with a custom bone shape (a cube) is selected. Enabling/disabling wireframe setting under custom shape affects the wireframe thickness of the other custom shape (the circle).
The issue has been seen on two systems:
- Blender 2.78 9cd6b03
- Blender 2.78c
- Ubuntu 14.04, gnome 3 fallback, nvidia graphics. Blender 2.78.5 b796ce0f26c