Debian AMD64, fglrx-driver
Broken: 2.72 and later
Short description of error
Texture shading in Texture paint mode is influenced by lights in the scene, which should not be and is inconsistent with Thexture shading in object mode.
Exact steps for others to reproduce the error
Just open the .blend file in 2.71 and in some later version, and you should see the difference.