Window 7 x64, i7-4820, Nvidia gtx780, 32gb ram
After generating rig with Rigify, the parenting with automatic weights fail to assign weights.
It still works in official 2.70a but not since 2.75 maybe earlier. Manual weight painting still works.
Automatic weight still works with other with non-rigify armature.
Exact steps for others to reproduce the error
Parent(Ctrl+P) the rig to the model with automatic weights: (Ctrl+P not executed in this file yet)