This is the one area where the competition (SBS-1) has an advantage over the Radarbox, and it's a problem Airnav have know about for 5 months, and was meant to be fixed this month.
Now fixing this bug is being delayed so that Airnav can develop some new functions in Radarbox. I, for one, would prefer that they fix this significant bug, rather than develop new features.
Sorry about the rant, but I currently have 5 Loganair and 3 Flybe aircraft in my list, with no way of knowing what routes they're flying :(