problem saving large report to snapshot/pdf format

[Davros]

hi
the problem i have is that i cannot export a report which is more then 50mb big. this problem occurs when i try to save the report as either of the above. i can export the report and all records up to 50mb then the images and one subform which is within the report refuse to appear on the final snapshot/pdf document.
does anyone know how to get around this?

thanks