Norton UTILITIES (on Win 8) - ...after a CLEAN SCAN cannot RESTART button fails

Norton UTILITIES (on Windows 8) - after a CLEAN YOUR DISKS scan the RESTART button fails to work when clicked... so a 'manual' restart' is used instead. Mildly annoying.

 

Any ideas why the RESTART (middle option) button does not work?

 

Yes, the REFRESH button is operative.

 

Thanks for any support and helpful comments.