While trying to duplicate the 'radar bug' I might have found something else... On the C screen. It might be a bug, appears to be dead.
I can confirm, that it is a real bug!
Hpasp Free SAM Simulator, "Realistic to the Switch" (U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.) http://sites.google.com/site/samsimulator1972/home