I have a calculation that based on a condition should display one of two graphic container fields...

 Case(

Validity = "Valid"; ValidGraphic;

Validity = "Invalid"; InvalidGraphic;

InvalidGraphic) 

But while this worked in my first test case, it hasn't worked since. The calculation field is always blank. What should I do?

Simpler:

Case (

Validity = "Valid" ; ValidGraphic ;

InvalidGraphic

)

fine, that simplifies my case() statement, but still how does the graphic appear?

Is the calculation result set to container? Are your graphics fields global containers?

Yes and Yes

Does your Validity field have data? Is it a text field? Do you ever get the invalid graphic? Have you put the global container fields on the layout to make sure they have graphics? Have you tweaked the formatting on the container calculation to enlarge the graphic to fit the field, etc.?