Hi,
Sometimes we get this.
Two things to check.
Try opening the report in Info Analyser and Viewer. Sometimes a report will be blank/wrong in one and OK in the other.
Sometimes people enter date parameters incorrectly causing a blank report. Some of our reports need the date to be added as 'Date(YYYY,MM,DD)' on desktop but in Designer you can just enter 'DD/MM/YY' depending on how the report has been set up.
Jon