I’ve done the same with increasing the memory limit however I’m still having this problem.
Did you make the following changes to your wp-settings file?
if ( !defined(‘WP_MEMORY_LIMIT’) )
define(‘WP_MEMORY_LIMIT’, ‘32M’);
change to:
if ( !defined(‘WP_MEMORY_LIMIT’) )
define(‘WP_MEMORY_LIMIT’, ‘64M’);