Hi John,
1. What is the OS version?
2. What is the exact version of SAP Crystal Report Designer?
3. What is the exact version of MS Excel?
4. What is the version of crdb_ado.dll?
Excel compatibility mode:
After you save a workbook in an older format, Excel runs in Compatibility Mode. In this mode, you can’t use any newer functionality that your newer Excel version provides. This ensures that you do not add enhanced features to the document that people using an older Excel version cannot view. Exit Compatibility Mode by clicking "File," selecting "Info," and then clicking "Convert." Excel converts the document into the current Excel format that matches the application version you’re using. For example, if you’re working in Excel 2013, it converts the document into that format to give you the ability to take advantage of Excel 2013’s latest features.
Workbooks are opened in compatibility mode Excel 2010 or 2007
https://support.microsoft.com/en-us/kb/2629973
Let me know if it helps.
Regards,
István