FSDS2.24 problem

Gentlemen,I've been using FSDS 2.24 casually to develop scenery objects for a while now. Recently, I have a problem. I want to place red obstacle lights ontop of buildings. I create the bulb object, color it red and use the light_beacon as object type. All such objects are appearing green in the scenery. I did this without a hitch in another scenery file from several months ago. Any suggestions would be appreciated.