Jasperserver 5 and Hyperlinks

We have just upgraded from 4 to 5.

We have one report that is purely used as a way of launching other reports (loads of images with hyperlinks on each one).

Where there is a link to another report that that has an Input Control, the input control opens but is blank and you cannot get it to dispaly the Input Control properly .

All hyperlinks are created as follows:

Hyperlink Type - ReportExecution

Link Parameter Name - _report

Parameter Class Name - java.lang.String

Value Expression - "repo:/fiolder1/folder2/report_name"

Hyperlinks work correctly where there is no Input Control.

Any thought would be greatly appreciated