I am on version 8.0.7600.16385 32 bit..
The pop up ad covers and sometimes duplicates words in the text. Does it as well on IE 9.0 in 32 bit at work.
All other browsers work fine.
even an older version of netscape works.
I upped the add blocker in ie 9.0 and flushed the cache.
From my experiance it is a mouse over from the upper adds that causes it.