Navigation Stack and Stage Questions

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I'm working on using the navigation stack with a simulated robot in stage. I have a used the sample move_base_fake_localization_5cm.launch and have no problems with it. However, I'm trying to work with my own simulation. I have a few problems, and I don't know if they are related or separate.

1. When I run my launch file, everything launches, but I get a warning over and over. The warning is: The origin for the sensor at (3.00, 6.40) is out of map bounds. So, the costmap cannot raytrace for it.
2. When I launch rviz, nothing lines up right. The robot is not within the map. The robot is also at a 90 degree angle from what it shows in stage.

Stage shows everything correctly. Some areas of the map in stage are valid and others are not. It seems to me that the coordinate system that I see in stage and the coordinate system for the costmap are offset. Any suggestions on where to look to fix this?