Crazy weightpaint

Hello There!
I am rigging character. I fixed all envelopes and fixed weightpaint by hand and in one place no matter what I do few verticles doesnt follow influence.
Verticles has 100% weight.
-painted by hand - no change
-painted by checked vertexes in edit mode - no change
-checked vertex influence in n shelf I see only one bone influencing by 1 other by 0
What can be problem?

Many things can go wrong so better upload the .blend file