I currently have WordPress 2.8.4 and am attempting to upgrade it to 2.8.5. However, every time I attempt the "upgrade automatically" option and enter my username and password, I get something along the lines of the following error message:
"Downloading update from http://wordpress.org/wordpress-2.8.5.zip.
Unpacking the update.
Could not copy file: /public_html/wordpress/wp-content/upgrade/wordpress-2.8.5/wordpress/wp-comments-post.php
This happens whether I use the FTP or the FTPS method of upgrading. It seems that there is some issue with permissions, but I'm not sure which permissions to change, I've tried to leave them all at their defaults. I sometimes have the same problem with plugins, but multiple attempts at installing the plugin (often only one more attempt after the first failed attempt) seem to result in a successful installation.
Any thoughts on how I can fix this? Thanks very much in advance!