I also have been dealing with this since the hotfix, before the patch I saw Jester clear up noise from the radar and see and lock targets from around 20 miles out but since the patch it doesn't clear the noise, it doesn't show any contacts in radar and of course that means that it doesn't lock up anything either. I have tried flying head on, flying lower than the enemy or higher than the enemy and nothing seems to work. I hope this get fixed because right now the sparrows are just dead weight as he doesn't even lock to what I have pointed out in the hud.