Welcome to Robowiki!
Welcome to Robowiki and the RoboRumble! I corrected your DropBox download link for MojRobot at RoboRumble/Participants. Download links at that page need to lead directly to the file rather than a file download HTML page. This is so the Rumble client can grab them.
My computer is fighting rumble battles for MojRobot as I type this, so welcome to the rumble! :)