I've just manually upgraded wp2.6.0 to wp2.6.2.
Firstly I turned off all the plugins and then followed the wordpress instructions to upgrade to 2.6.2 using WS-FTP.
The database was updated ok but :
Now I get "You don't have permission to access /wordpress/wp-admin/ on this server." when I try to log in to the Site Admin. I've tried logging out and going back in with two usernames with Admin rights both give the same error message
I've cleared all caches and cookies, requested via the lost password and received the reset password link and tried the supplied temporary password for Admin and for another username with Admin rights. Neither of them are accepted.
I hope someone has the answer out there as I've just about run out of ideas.