An invalid value in a date field in your database prevents Reporting4Act! from running a report. When this happens, it prompts whether you wish to see the records with the invalid date values. If you choose Yes, the following dialog appears:

This dialog shows the raw data in the result set for the report and doesn't allow you to edit the date values. You will need to find the matching records in your database and correct the invalid date values in order to run this report.

Regardless of whether you choose to display the dialog of invalid date values, the report cannot continue because of these values.