My VEX keys are good. The Cortex unit appears to be good. The Cortex and the joystick pair when using the A-A cable. But when I try to establish the VEXnet connection (wirelessly), I get 4 red lights on the joystick and no connection. I've tried re-downloading all firmware and switching to brand new batteries in the joystick.

What else can I do to fix this?

Thanks for your ideas!

Just to make sure everything is set up properly, I would suggest running through our setup guide step-by-step: http://www.robotc.net/wiki/Tutorials/Ge ... _Joysticks. To be safe, I would also try new keys/cables/USB ports/different computer if possible, as these all could potentially be causing the issue.

If you go through the above steps and are still having problems, please let us know with as much information as possible (such as posting the results of the Software Inspection, (which is found under the Robot -> Advanced Tools option in ROBOTC), which version of ROBOTC you are using, etc).

Thanks for the feedback. I can say that I did try everything using another computer, cables, and keys. Same problem of all four lights on the joystick turning red. I even tried pairing 2 other joysticks with the same Cortex unit (I have access since I'm a classroom teacher), but got the four red lights on each of those joysticks, too, once I tried to go wireless. Here's the weird part: I was able to successfully pair and make a VEXnet connection with a fourth joystick--the same joystick I've been using for all my classroom demos.

When I get some time, I'll try to run the software inspection as you suggested, and I'll get back to you. Thanks!