On Friday, July 26, 2013 12:40:47 PM UTC-7, wrote:
Flew on Thursday and I didn't change anything since last Sunday's flight where everything worked great. I tried the same set-up yesterday and nothing worked. I kept getting a message that said it wasn't reading the vario data and then it couldn't read the GPS. Just locked up. I give up. Back to the old cable, Compaq PDA and Winpilot 13.01.

Are you running the WinPilot "Avier" version (latest)?
I am using this version now with the CAI 302 for some time without any issues.
I would seriously check for hardware related problems (connections, cables etc)
If you have an other program installed ( SYM, XCSoar etc) does it work with your setup?
I too experienced similar problems before, once sorted through all is working ok.6PK
One