If you go into the Options area, Connections tab and "show
NMEA debug window" you should be able to capture the traffic (sounds like there is some since you see number of satellites) and post a few samples here might be able to help diagnose. Looking for
NMEA sentences that begin $GPGGA, $GPGSV, $GPRMC or similar ("GP" is the most likely character set for the talker ID but could be something different).