Lee,
I think I understand what your asking.... When flying the gliders become visible on SD then keep diapering from the screen for a few seconds then re-appear on screen again. I thought it may just my PAW loosing connection to the server then picking it up again. It seems to be all OGN traffic only, from all stations at the same time (Pocklington, Burn, Ruff,) as I can see all OGN traffic at the same time when Central the the airfields. All other traffic is still displayed OK ( ADSP, Mod S etc.)