I have had this happen three times in the last week or so. Just Free Republic blocked, everything else worked. Meanwhile, I could access Free Republic on other devices, without McAfee on them.
I tried to find somewhere in McAfee LiveSafe to whitelist the site, but could not find the option.
Access just resumed on its own after a while.
I had this happen a couple of times a few days apart about 1 - 1 1/2 weeks ago. I also tried to find a place to white list with no luck, but about mid-day it usually resolved. I have not had any issues for a week or more.