my gauges have disappeared

Hi, I've got a problem with disappearing gauges(i.e. the whole lot!)in several of my planes,including default Cessna 182rg(other Cessna's are fine),addon Fokker f27 & Tiger moth. They were all working just fine but now I just get the panels with no gauges. I've tried reinstalling the Fokker(selfinstaller) but no luck.Any ideas on where to start looking would be greatly appreciated.I run FS2002.