The issue with Eclipse/BIRT designer showing a blank parameter page when we try to run a report has been around for a while. This problem is due to newer versions of IE installed on Windows. When I was using an older Windows version, I can simply uninstall IE to restore it to an original, older version. Recently, I had to switch to Windows 10 which comes with IE11 and uninstalling IE is not possible. The problem is described here in this IBM technote

After trying the various solutions found on the web, the following seems to work for me:
– In Eclipse, click on Windows > Preference. 
– Then under the General > Web Browser page, check the “Use External Web Browser” selection, and choose “Firefox” as the External Web browser
– In the same Preference dialog, go to the “Report Design” > “Preview”, then in this page, tick on the checkbox “Always use external browsers”
– After that, click on Apply and OK.