I don't run Norton but do have AVG installed. I didn't run a scan. Now that I came back, I see all the *NEW* posts since last visit - hours ago.

I suspect it's something with Firefox, because I did check and have cookies allowed. Maybe it clears some when I shut down, but other sites, and this one, remember cookies like logins. Places I haven't been to in weeks, the system remembers new and who I am.