no edit after displaying a post ore page

Hi there,
I have a problem after upgrading from 2.0 to 2.0.1
When ive been posting, its not posible anymore to edit that post.
When i want to edit, the page is refreshing to my blog, and the editor page is gone.
Ive been upgrading following the rules always without probs, so i think its something else but dont no what.