Broken:Blender 2.74 Official #000dfc0
Short description of error
A Particle System set to emit from Verts, no random, with ParticleCount == Vertices Count: The resulting Particle System Indexes do not match those of the Vertices.
The issue seems only to come into play if the source Geometry has separate Mesh Islands!
See attachement Image:
(I used Sverchok to Display the Geometry Vertices!)
Exact steps for others to reproduce the error
Open Bug_ParticlesIndexing.blend and compare ID of Particles with ID Vertices.
(For easy display of Vertices you can install Sverchok