Before the upgrade, whenever I uploaded a file or I updated a plugin, the files were store by “admin”.
Now, after th upgrade to wordpress 3.01, the owner is “guest”.
This is very enoying…! due to the fact that each time I want to upgrade / upload something I need to change permissions to 777 and then switch back to 755.
Contact your hosting provider and ask them to CHOWN the files back to your user. If you’d like to prevent this in the future, ask your hosting provider to run suPHP.