Facebook Invalid URL message

I know, I know, Facebook problems are kind of petty, but this is a very annoying one for me. My business does a lot of FB correspondence, thus making it vital to our success. We have 7 PC's in our office, mine the only one running ESET, and the only one having this problem.
I'll be working with FB and suddenly links stop working, or sometimes, FB won't come up at all. Instead I get this:

Invalid URL

The requested URL "/home.php", is invalid.
Reference #9.9cfc54b8.1346024662.25af744f

When the links stop working, and I restart the app, I'll get this message. I am constantly flushing dns, sometimes it works, lately it rarely does.
I'm about ready to ditch ESET over this... Any ideas?
Oh, and FB is in my list of "allowed" sites... seems to be a very useless list, lol.

 

If you don't get any alerts from ESET it's unlikely to be the culprit. Does disabling http scanning in the program setup make a difference?

 

What makes me think that ESET is the "culprit"? Every time the "pop up" appears that the "antivirus database has been updated", that's when the problem occurs. Haven't tried disabling http scanning, but will. Thanks for the reply.