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Looking at Openni.launch shows:

  <!-- Use OpenNI's factory-calibrated depth->RGB registration? -->
  <arg name="depth_registration" default="false" />

meaning you need to instead run

roslaunch openni_launch openni.launch depth_registration:=true

Although you are reporting that depth_registration works without setting that argument to be true, which is odd. Regardless maybe this will fix the issue? worth a shot...