Windows 7 64 bit
8 GB RAM
Intel Core i5-2400 3.1 GHz
Broken: 2.77 22a2853
Worked: Edit Mode Boolean new in 2.77 so not applicable
Short description of error
Edit Mode Intersect (Boolean) works fine sometimes, but depending on position of vertices fails completely sometimes, in 2 distinct ways.
Exact steps for others to reproduce the error
See attached 2 simple blend files with intersecting vertices of cube and UV sphere in a single object, sphere vertices currently selected. In first blend file when running Intersect (Boolean) all vertices disappear. In 2nd blend file when running Intersect (Boolean) the outline of the sphere is created as vertices on the cube.
In 3rd attached blend file Intersect (Boolean) works perfectly and cuts out partial sphere from the cube.