Cannot add a folder to real time exclusion list

Hi, I use Norton360.  I'm trying to add a folder to real time exclusion list (under Setting>Antivirus>Scans and Risks>Items to Exclude from Auto-Protest, Sonar ....).  I was able to pick the folder that I wanted to add, and it was placed on the exclusion list.  I then clicked Apply and OK.  I thought the folder had been added to the list.  But when I got back into this function, I found there's absolutely nothing on the exclusion list!  Where did it go?  I ran as an administrator.  Can anyone please help?  Thanks.