A hard one to explain here...
When I navigate through some menu items in admin panel or switch between admin and site I see a page that looks like CSS has gone or broken but a split second after that the page is formatted correctly.
It seems to take a little longer to apply the formatting! I noticed this using the jquery fix to get IE9 working but it was so slight.
It seems to be more pronounced now.
Firefox. Looks like CSS is broke then it comes good.
IE9. Looks like the page "flickers just before full load.
Chrome. Same as IE9, looks like it flickers.
Any suggestions?
(Dev team, PM me and I will set you up with admin if you need it)