Pivot Charts work as a Creator USER but not a customer portal USER

Pivot Charts work as a Creator USER but not a customer portal USER

Can someone explain why I get beautiful charts ( even if my form data is multi-select) as a Creator USER ... but when I access the Chart as a customer portal user - it just won't work?



Seems to me that if I can create a chart and view it as the administrator - I ought to be able to make this available to my portal users  - ( or am I being totally unreasonable?)

Thanks in advance for your response,

Craig