Airnav,
Thanks for your reply. Looking in database explorer CH column, the only updates are from my own received flights (which aren't much as currently on the indoor aerial). The last time anything was added/updated from the network looks like it was 25th July this year, which is also the same time I installed the new NavData db3 file from this forum. Ever since then I've noticed less and less routes. Particularly as I often view over my old location in NW UK.
I also looked at properties of the navdata db3 file, the read only box was unticked. (See pic).
I'm guessing I've done something daft, but unsure of what yet!
Cheers,
Phil