rviz over Wifi "brw_upload_constant_buffer: Assertion" failed

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I have ros setup on two machines connected by wifi, one on my robot, the other on a laptop, using the ROS_MASTER_URI approach. I've confirmed proper operation using the tutorials.

When I start rviz, it connects and brings up the gui for a spit second (I can see my robot model and everything as it should be), then crashes with this error:

rviz: brw_burbe.c:265: brw_upload_constant_buffer: Assertion 'brw->vs.constant_map[i] <= nr' failed.

Any idea what's happening or how to fix this?

Thanks!