Whenever you get this, chances are you made a mistake. Check the following things:
- Are you connecting to the same database?
- Are you using the same user to connect?
- Are you using the same report?
and last but not least:
- Are you passing the same values to the same parameters?
I have been staring at an empty report generated with the reports webserver for 1.5 hours before I realized I misspelled the parameter name in the url.
Maybe Reports should warn users when they are trying to pass values to unknown parameters…… Or should I pay more attention to what I am doing?