The latest Team Update from FIRST indicates that there are some radio problems which IFI is working out, and which are also discussed here
http://www.chiefdelphi.com/forums/sh...ighlight=radio
As for the tethering, remember that you have to use the red cable to make a tether connection. You can extend it using black serial cables which will allow you to do a little test drive without the radio, just remember to anchor the cable on the robot so it doesn't pull on the tether plug of the RC if your robot goes a little farther or faster than the cable will allow.
We expereience some glitching with our new radios on Saturday, switched to last year's and everything seemed to work out okay. Not much help if you don't have old radios to fall back on, though.
Jason