The Overdue Receivables listing report is based on the Customer Current Transaction file. You wouldn't want to restore just this data file from a back-up - if you have posted batches in the last week, doing this would certainly cause integrity errors.
First, make sure that all of the ranges in your report are 'blank' to 'zzzzzz'. It may be that you have a range in the report from 'blank' to 'blank', which won't select any invoices. You might also want to try disabling the 'Remember Report Settings' option in the company profile. The likely problem has to do with the report ranges not selecting any invoices.
Second, do an inquiry on a customer. Go to the Transactions tab and display Current transactions. If any customer shows existing and unpaid invoices, then the data is still in the system.
Third, try a different report such as Customer Transactions or Aged Trial Balance. This report is based on the same data file as the Overdue Receivables report. If you get information from a different report, this also indicates that the data is still in the system.
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Regards,
Softrak Tech Support