Thanks for the help!
Like the previous poster, I just joined to say a big thanks for helping me resolve this issue!
This started for me on Friday as well, which is odd in the extreme, that many had this exact problem happen on the same day.
I called Apple, and the first layer of help couldn't do the trick, then I got a senior advisor, and still no solution. They kicked me up to an engineer. Only today did they get back to me with the engineer, but just in time I found this answer by using google. If not, they were prepared to upend my computer searching for a solution to the problem, which they never would have gotten, since they really have no dealing with Norton.
All the answers in this thread did the trick, and I'm just so glad I found this before they destroyed my computer with a bunch of non necessary action! All the instruction here was clear, and easy to understand, and easy to follow!
I did call them back to let them know this solution just in case they are getting a raft of other complaints from other Mac users about this issue.
Thanks again!