This is a strange one and will need other to confirm please.
When I set an alert up that I know will happen within a few minutes nothing does.... That is until I either restart RB, disconnect and reconnect the feed.
Example:
Setup alert to email and notify on screen when:
FlightID EIN739
Range 90 nm
From Home location
Now if I sit and watch the flight come within range nothing happens, as soon as I do one of the above (restart or disconnect/reconnect) then the alert happens.
Tried it a few time with different alert settings and different aircraft both live and network, always the same result, nothing happens unless I (restart or disconnect/reconnect)
Can someone else have a try.