I can't access /admin on IE7 but on FireFox it stays stuck on loading page. Also sometimes the save draft and publish buttons disappear after i make an edit and which to save.
A've had same prolbems with FF ans silverStripe, in my case the problem was the FF plugin AdBlock Plus, with a certain ruleset (I forgot wich one). Try it setting Adblock disabled for your domain.
got it working thx