Wordpress "Could not create directory" Fix

You may be seeing this error frequently after upgrading to Wordpress 3.0.3 or so. Basically, after you've upgraded Wordpress and attempt to auto-upgrade a plugin, you'll see an error that says:

Downloading install package from http://downloads.wordpress.org/plugin/whatever.zip...

Unpacking the package...

Could not create directory. /public_html

Once again, this is a simple one. Go into your FTP program, within the area:

"/public_html/wp-content"

...and look for the "upgrade" folder. Delete the entire "upgrade" folder (trust me on this).

Now, you should only have two folders and one file that remain: /plugins, /themes and index.php. Create a new folder called "upgrade". Change its CHMOD permissions to 777.

Now, try the plugin auto-update again. It will work :)

For some reason, the /upgrade folder that remains after this Wordpress update isn't satisfactory to the new version of Wordpress. By deleting it and creating a new one, you're eliminating whatever confuses the new version of Wordpress.