The reason you see the darbar where it seems to be on the fritz is this:
The Darbar alt was never changed, while the radar detection was changed. It is now down to 65ft. The Darbar is activated above 500ft, so if you have a low alt fight inside a dar ring without killing the dar... then you're going to see a million and one red dots with little or no darbar.
I also find some NoE missions hilarious for this reason... They stay under 500ft, but above 65 and think they are being slick.