@leejosepho: those are not relevant suggestions. There is no reason to go to third party plugins to replace core WP functions.
@almz: you have a plugin or theme conflict after the upgrade; take a look at http://wordpress.org/support/topic/troubleshooting-wordpress-35-master-list?replies=4 abd see if that helps. If not, ask your webhost; they may have some restrictions on their file system.