It was the quotes. AAAGGGHH!
Thanks for the quick reply
>Dennis,
>
>I did the same thing yesterday :) thought I was going crazy. Is it possible that the field is a character and not a numeric?
>
>this is what happened to me, no data type mismatch errors etc., just a white line.
>
>also, you don't need the quotes around the expression:
>

"IIF(lvSchedule.order_display=0,RGB(255,255,255),IIF(lvSchedule.order_display>0,RGB(128,255,128),RGB(255,255,128)))"

>i.e.
>

IIF(lvSchedule.order_display=0,RGB(255,255,255),IIF(lvSchedule.order_display>0,RGB(128,255,128),RGB(255,255,128)))

>
>hope this helps