I use FF, and never saw that...until I went and looked at the thread you said...Then I noticed I wasn't logged in. Log in, and the thumbnail shows up fine. Check to see if running an adware program didn't kill your cookies. I ran mine last night, and bet something there killed my log in cookie. Jim.
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3