Can only export "All Users" report as CSVDE

Can only export "All Users" report as CSVDE

Hi ADMP team,
 
When I try to export the "All Users" report, a new IE window opens with the address http://localhost:8080/Report.do?methodToCall=exportReport&reportType=csv&reportList=true but the file download dialog box doesnot appear. Only export as CSVDE opens the download dialog box.
 
What is causing this please?
 
Thanks for your help,
 
Pete Smith.