Black Vapour Trails

Help? Got a slight problem with black vapour trails. It isn't only vapour trails it is anything to do with smoke and spray. I first noticed it when taking off in the wet as it looked like smoke coming from my wheels and after that all vapour trails became black even AI trails. Not only are they black but they are also filled with black square bits, which I only noticed when I paused mid flight and the bits starting floating around my aircraft. I have been flying this install of FSX Accel Pack for a long time without any problems till now. Ibelieve something has got carrupted but don't know what or where. I tried a repair but that didn't seem to fix it so now at a loss untill I decide to do a complete install. Any help before then would be welcome