Migration of FS2002 AC to FS2004 re: strobe lights

Hi, My FS2002 AC appear to be running OK since I migrated them over to FS2004. I have noticed one thing though when looking at the spot view that the strobes are not working even though I have turned them on in panel view. The logo lights and landing & taxi lights seem to work but it's just the strobes that are not functioning (flashing). Does anyone know of a fix for this, say, do I have to add a line or update a line in my aircraft.cfg file to get the strobe lights to work for any of my migrated FS2002 AC?Thanks for your time,Tom