Sorry for the delay in getting back to you.
I checked it ah home last night on IE8 and it was fine, so thought it must be me, but have just checked in work and on IE9 its still doing it.
Basically the 100% width bar across the top holding the nav for some reason moves to the right, but seems fine in the other browsers.
I checked twice over to make sure I wasnt going mad, as sometimes it doesnt happen on load, it seems to move after 10 seconds.
Thanks for getting back to me though.
OK a quick note, I just clicked the 'compatability button' and it seemed to fix it, but thats not the answer is it?