Stu,
Glad to hear you have finally got things working. I'm pretty sure that is the first SDR Dongle I have heard of going faulty other than a few examples which failed due to overheating early in the development programme, so I guess you were just unlucky.
That's certainly what I would expect to see both on your PAW Traffic Screen and Nav System display. You will probably need to close your filters down a bit for practical routine operation, but leave them fairly open until you get used to the various alerts.
Any probs come back on here or drop me a pm.
Best Regards
Peter