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It's rather unusual to only have 0.0 ranges in the scan message. This also pretty much rules out issues due to rays hitting the inside of the laser box geometry and therefore not appearing in the scene.

I'd first test if the situation is different with the standard (not GPU) sensor. I've seen graphics driver related issues with the gpu ray sensor before, so it's a good idea to test for that. For the differences between both you can have a look at hokuyo_utm30lx.urdf.xacro. This macro contains both a gpu and non-gpu script. If the non-gpu sensor works, you're looking at a graphics card/driver compatibility problem.