Robots like e.g. gh.mini.GrubbmGroup_0.4.jar which contains the two .jar (nested) files gh.mini.GrubbmOgre_0.4.jar and gh.mini.GrubbmGrunt_0.5.jar causes troubles in TeamRumble, meaning that the team members cannot be found: "Can't find robot: GrubbmOgre 0.4" and Can't find robot: GrubbmGrunt 0.5".
This bug has been fixed and verified with TeamRumble and MeleeRumble.
This bug was fixed in version 1.7.2.0 Beta 2.