Try each of the following options until the issue is resolved:
  1. If using Crystal Reports XI (or 11.5), verify that the table joins are set to Left Outer Join.
  2. Run the report with fewer records in the export.
  3. Right click on subreport and select Format Subreport, unmark Keep Objects Together
  4. Preview the report and click on the stop button, then repeat to run the report in increments.
  5. Update Crystal Reports to the latest service pack
  6. Export the report into another format (ex: PDF, RTF, Excel)
  7. Check available free space on local disk drive
  8. Check the Swap file size
  9. Uninstall and then install the Crystal Reports runtime components