Dual Display problems with build 7057

Hi guys,
I've upgraded windows 7 from build 7000 to build 7057 (totall reinstall not just upgraded). My pc is connected to the TV (for movies and such), when the computer boots both displays work fine. After logon however I cannot get the second display to work. I can expand them all I want but, it simply won't work.

any help please? thanks in advance

Hi Johan, it looks like others are experiencing this problem with 7057 from what I can see on the net - but I've not spotted a solution yet. The RC should be out soon, so it might be worth waiting till then and seeing if it's fixed