Recently I noticed an interesting thing - after opening my blog in FF I noticed a blocked object icon in the middle of the header section (blocked by FF NoScript plugin). It was a flash object linking to:
bin.clearspring.com/at/v/1/button4.swf
I don't have anything at that site and I'm not using any widgets. I compared original theme files with those on server - identical, so one idea is that it's coming from WP engine. But it's just a speculation of course. Does anybody had something similar?
BTW after reloading page, blocked object icon disappeared and further reloads didn't show it... strange