PB Protege 9.0 computer, if yours is giving you guff. I've never had an issue with it, except for when I swapped out front wheels and forgot my magnet. It doesn't work so good then.
I ride all winter, so it's seen 20 straight days of rain and temperatures down to 16 degrees F. Still runs like a champ, but the thermometer on it has always been a bit off calibration.