I can't find "action","info" button on each clusters of the head plugin site

in the Head plugin web ui page.
i could not found "Action" and "Info" buttons.

at first, i thought it's elasticsearch verison compatibility issue with head plugin.
But. i reinstalled elasticsearch from 1.2.0 until 1.0.0.
same issue is occured.

What's the problem would you be?
plz somebody help me.

$ java -version
java version "1.7.0_55"
Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)