Rviz image status "ok" but no image

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I'm having trouble viewing a kinect image in RViz. Today, the same rviz config file that has worked in the past did not work. I thought there may be a problem with rviz, so I uninstalled and reinstalled it. That may be part of the problem.

System:

• ros hydro on ubuntu 12.04
• rviz version 1.10.20 compiled against OGRE version 1.7.4 (Cthugha)
• Video card (from lspci): NVIDIA Corporation GK106 [GeForce GTX 645 OEM] (rev a1)
• using kinect v1 with openni_launch driver

Steps taken:

1. Click Add, select Image
2. Set topic to /yellow_kinect/rgb/image_color

Result:

• Image status is "Ok"
• Number of frames is incrementing normally
• No image shown -- just black pixels in the image panel

Other things tried:

• Tried using the Camera display type in my RViz, instead of Image. This does not work either (it's an all-white image).

Sanity checks:

• rosrun image_view image_view image:=/yellow_kinect/rgb/image_color -- When I do this, I see the live image, not black.
• I confirmed that RViz and the kinect are both talking to ros master on the same machine (my robot)
• When I try the same thing from another computer in my lab, the image shows up correctly in RViz.

I think it's an issue with the state of ROS or RViz on my desktop. I was using RViz constantly with the same system setup for weeks. Then I wasn't using it for a few weeks, and now it's broken.

Any suggestions on how to make RViz display the camera images would be greatly appreciated!