**System Information**
Archlinux
Nvidia 7900GT
**Blender Version**
Broken: Blender 2.69 Release (from arch repo)
**Short description of error**
Overlapping vertices cause boolean operations to give unexpected results.
**Exact steps for others to reproduce the error**
Based on {F34159}
1. Open attached blendfile
2. Notice that the sphere does not join with the cylinder like one would expect
3. Move the sphere slightly
4. The sphere and the cylinder now join as expected