SmartDashboard not connecting to robot.

[Stuart Hunt]

Our roboRIO is working fine, and we're able to wirelessly deploy Java code and drive it around, but the SmartDashboard won't connect to the robot. When we add a connection indicator, it just stays red. I tried un-installing the SmartDashboard and then reinstalling it by following the online instructions. The latest version I could find was 1.05, but it says it was created in 2013... After reinstalling it, somehow it did not prompt me for my team number, it remembered from last time. In addition, the preferences menu doesn't have an option that the instructions say it should have. It has no "use mDNS" checkbox. This makes me think that the preferences file didn't get deleted when I uninstalled it.
I also tied installing the SmartDashboard 2.0, but that didn't work either. None of the SmartDashboard code values would appear.
We were able to successfully use the SmartDashboard last year. Does anyone know what we can do to fix this?