1. Click cancel on the "select data source" window that appears
  2. Open the export that is used with the Custom Report
  3. Click Export Now to re-export the data (make note of where the .MDB file is saved)
  4. Open the report in Crystal Reports
  5. Go to Database > Set Datasource Location
  6. In the Replace With box at the bottom, click "+" next to Create New Connection
  7. Click "+" next to Database Files
  8. Browse for the export file saved in step 3 and open it
  9. Select the export file and click Update
  10. Click Close and refresh the report
  11. Save the report in Crystal and preview the Custom Report in the Blackbaud software again