Please could someone help with a really annoying problem!

 

I have a report and subreport (consisting of a cross tab only). I have linked fields from the main to sub report but, when I run the main report nothing displays.

 

However, if I hover over the placing of the subreport and open that, it displays data based on the fields that I have passed through succesfully.

 

So it looks like my links are OK but something else is going wrong.

 

Any ideas please?

 

Thanks :)