I had some odd behavior in the DTA this morning. I had run a Smart Search and was mousing over the titles in the produced list, and when I moused over one, the popup would be blank (screenshot); I'd see the three squares one time, as if it was thinking, then it would go blank. If I moved off and then back over the same title, the popup would populate (I'd see the same squares, this time cycling a couple times before the text filled in).
Any mouse-overs on that page after that would work fine, until I scrolled down the list, then the first popup would not populate again. Off and back, and it worked fine. All would populate until I scrolled again, then the same problem would occur.