Okay..part of troubleshooting...I copied the url for the main page of TB and plugged it into IE. I do see the lower right hand special run window. But not on FF. I also see in IE there are not only no RailImages or Media at the top, there isn't even a space for them, not boxes, no blanks spots. Weird.
I have not been able to duplicate the pop-up screen I saw yesterday, with TB or any other site I visited. Either a one-time event, or possibly I accidentally clicked on something while moving my pointer across the multiple monitors and windows I had open.