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Hmm - it says: "java.lang.ClassNotFoundException: dz.MostlyHarmlessNano_2.1.dz.MostlyHarmlessNano", and all the other class names seem similarly warped. I think the class it should be looking for is just "dz.MostlyHarmlessNano". Could you check the filename of MostlyHarmlessNano's JAR? Is it dz.MostlyHarmlessNano_2.1.jar, or something else? I'm wondering if the RoboRumble client did something weird in downloading to the wrong filenames and it's throwing off the class names that Robocode expects to find.

You're right, it's just dz.MostlyHarmlessNano_2.1.jar. I wonder why Robocode is doing that?

I don't have a RoboRumble client, so it can't be that.