Thanks, ldln & zentara and also Albannach who responded in the CB. I know it works fine on Linux! But Linux doesn't use the Win32 native colour chooser, nor does it have msvcrt.dll! I have tried it on 3 machines now, two are XP-XP2, the other is Win2k - all are very up to date. I have some others I can try, but ti is looking pretty consistent. My tech support guy has the same failure on his machine too.