Can't delete antispam allowed list from NIS 2013

When I remove one or more email entries from the antispam allowed list, hit apply and then OK the entries are gone but reappear when I come back to the program.  Same with blocked list and if I add an email to the allowed or blocked list its there after I save it but its gone when I come back to the program.

 

I was going to uninstall the program and reinstall but I've used my product on 3 machines and I'm afraid it won't allow me to delete and install again so I have not tried this approach to clear out the entries.

 

Using Windows 7 and my Norton product is 21.3.0.12. 

 

Any assistance would be appreciated,

Thank you,

Jim