In order to help you more accurately we will need some additional information. Do the sub-reports display any error messages or are just empty? If there are error messages then we will need to know what exactly they say. If they are empty, the problem might be that for certain values of the master report there is no data for the sub-reports.
Additionally we will appreciate if you open a support ticket and send us a sample solution that demonstrates the problem. This will be the quickest way to identify the culprit.
the Telerik team
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