Odd WinPilot Problem

I recently installed a new Colibri logger and cable set up so that the GPS
antenna could, in addition to driving my Colibri, also provide GPS data to
the IPAQ 3970 with WinPilot 7.0.

After three good flights with no problems from the Colibri or the IPAQ I got
airborne a fourth time to find a "NO GPS data" messsage on my IPAQ. I
thought it would a simple case of just dong a soft reset of the PDA but no
joy.

Maybe a Comm Port issue so I tried all 8 Comm Ports at 9600 baud but still
no GPS data. I then tried a friends IPAQ 3970 with WinPilot 8.0 but again
no GPS data. This was looking more like a wiring problem or worse another
damaged IPAQ input plug or receptacle. The guy who supplied the Colibri and
cable set up was adamnant that the problem would be software related rather
than the new cable and logger. He suggested I try a Trial Version of
"FlywithCE". Surprise, surprise the IPAQ worked again and I got a good
distance and bearing to a local Turnpoint. Winpilot however still fails to
find GPS data. The Colibri is sending all of its possible data to the IPAQ
so I have no idea what could have gone wrong with my WinPilot. Anyone like
to offer a possible cause and/or fix?
Peter