This may be tied-in to the ongoing autopopulate problems following the server rebuilds. Maybe Airnav can clarify if autopopulate is now working fully.
1,000 unknowns sounds high, I currently have 189 unknowns, which is also quite high compared to my past experience. This might suggest that there is still an autopopulate problem.
If its not a problem at the Airnav end, then it my be your firewall that's blocking updates. Are ANY aircraft populated with Registration and photos?