FreeBSD 9.2 amd64 GeForce GT520
Broken: master 30-09-2014 c7694b4
This might be a rare edge case but pretty specific. I would describe it as adding geometry to a mesh object that has a multires modifier causes bad geometry when the new geometry is close to or part of faces with flipped normals and multires alterations.
Steps to produce -
- With the default cube enter edit mode and flip the normal on one face - Ctrl-Shift-N
- In object mode add a multires modifier and subdivide a few times
- In sculpt mode move both flipped normal and non-flipped faces
- In edit mode add a loop cut
- Enter object mode.
If you subdivide the face opposite the flipped normals (step 4) you don't get any distortion, similar with altering more detailed meshes away from flipped faces, the new geometry needs to be part of or adjacent to the flipped normal face/s and the multires reproduction of the new geometry needs to already be moved within the multires data.