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I'm getting the same problem very often. It may or may not be related to what you're seeing, but here's my take:

My observation is that it helps to quit out of all ros processes (incl. rviz) before starting the openni launch file. Once the launch file starts, wait for a couple of seconds until the driver is fully up and running, and then start rviz. It seems that if something subscribes to the topics before the openni driver is ready, things break down.

It sometimes a couple of retries before it actually works.