Data binding cross tab in Crystal 2008 with Xcelsius swf file

I've created a visualisation in Xcelsius and want to bind it to a cross tab in CR2008. The labels appear correctly in the swf visualisation but I get no data. The format of the table in Xcelsius and the cross tab I believe to be the same, covering data formats. I have placed the Xcelsius visualisation in page header "a" with the cross tab in page header "b". The Xcelsius table has been defined in terms of column and row headers as well as data area, so I've done everything that I understand to be correct. In CR2008 I have specified that I use the existing named cross tab.

Does anyone have any idea what I may have missed.

tia

Neil