I too have had similiar issues resulting in me reverting back to IE8.
I have recently upgraded from IE8 to IE9.  Since doing this I have problems with some sites. EG.  On the National Lottery site when I try to play an Instant win the site refuses to complete the game.  On returning to IE8 everything goes normally.  There are other sites but this is the most obvious one.  I have just returned to IE8 in the meantime and would welcome any comments. ron
IE9