Windows 10 (x64) (version 1703), GTX 750Ti
Broken: 2.78c and latest build blender-2.78.0-git.2836003-windows64
Short description of error
When the bevel modifier's "Clamp overlap" option is active, clamping is applied even though it's not required.
Exact steps for others to reproduce the error
- Open the attached file that I reduced to the most simple example
- Repeatedly switch the "Clamp overlap" option on and off to see that it affects the mesh.
I expect the option not to affect the mesh because there is no overlapping even if the option is inactive. This case is different to other reported cases as there is only one edge involved.
Please note that, if you move the three top vertices upwards (in Z direction), clamping is not performed anymore. However, this shouldn't make a difference in this case.