Interface Builder not starting (iPhone SDK beta 6)

Hi,
I have upgraded my OS to 10.5.3, uninstalled SDK beta 5 and installed SDK beta 6. Since then I cannot start Interface Builder (the icon bounces 3 or 4 times and the application hangs). I tried to reinstall it again and nothing changed.
Is that a known problem with beta 6? I have a friend who does not experience this problem. Any workaround?
Thanks and best,
Rodrigo

How can it be possible? you invest some money believeng you will start something great and develop allied with the biggest intrepeneur of the world,and... boom. what you see.... isnt really what u get. Why this beta 6/7 Interface Builder crashs when u scroll around too see some v2.0 aspects of the i-phone? just some secret aspects or a little glitch on the final build ? lets see if we can have a taste for it... i was really anxious...

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