Colibri logger download problem

I am having problems downloading flights from my Colibri.
It feeds NMEA to my IPAQ OK, and I can upload and
download tasks, waypoint and declarations etc. I know
it has logged the flights because I can retrieve all
the flight stats etc...but when I try and download
the data the system hangs. I have tried using LXe,
Tasknav and the IPAQ software. I have had no problem
in the past. Any ideas???

Thanks Chris