Does your sub report have any data in it ... it may be that the sub report is not generating any data. Also anything in the in the PageHeader section of the subreport will not display in the main report.
Hope this gives you a starting point ...
Originally posted by jill
I'm having problem to print preview my subreports in a report. Only the details from the report are displayed but not the subreports. My report is displayed via the print preview button from a form.