Comment 52 for bug 729979

Nvidia has added a new option for the drivers, "Use Conformant Texture Clamping" in version 302.

As of 302.17:

"Added a checkbox to nvidia-settings to control the texture clamping attribute. When the box is checked, OpenGL textures are clamped according to the OpenGL specification. When it is unchecked, GL_CLAMP is remapped to GL_CLAMP_TO_EDGE for borderless 2D textures."

Could this affect the issue?