To reproduce:
1. Open attached 5.0 project (don't change layout, it makes it easier to notice the problem)
2. Run scene Testscene
3. Move mouse around in game view (If mouse is over the mesh a raycast is calculated to find the collision point. If there is an intersection, it will do a SphereCast to do a sphere collision test.)
4. Notice that the sphere cast will not return the closest collision, but instead it seems to return the first collision that it finds (on screenshots attached it is marked as yellow sphere, green line is an angle between them, which should be around 0 on that surface)
http://screencast.com/t/03dNam0wwMcG

Works fine if mesh is uniform or convex
http://screencast.com/t/GOGf9rYQ5

Regression from 4.6