This is in relation to all the other comments about having issues with Allowed memory size. Except this current version is 3.0.3 not 2.8.x.
I've tried adding
define('WP_MEMORY_LIMIT', '256M' ); to the wp-config.php file correctly and deactivating plugins one by one.
I've had some luck in upgrading plugins but not entirely 100%.
I'm trying to upgrade to 3.0.5 but I still keep getting the Fatal error listed below, however sometimes it's not class-simplepie.php but sometimes it's wp-db.php that shows up instead.
I do not have access to the php.ini file.
The following is listed on, WordPress Blog, Incoming Links and Plugins within the Dashboard.
Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 92160 bytes) in /httpdocs/wp-includes/class-simplepie.php on line 14907