I have my memory limit set at 128MB in php.ini and wp-config.php. There is an implicit minimum requirement for the WP Admin to be able to use 256M.
Try setting your PHP memory limit to 256M instead of 128M.
Also, be sure you have WP_DEBUG set to true in wp-config.php:
define( 'WP_DEBUG', true );
Which will likely reveal an exhausted-memory fatal error.
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