After loosing many hair because of random white pages in wordpress admin, especially on plugin page, i finally found out the reason of this problem :
First, don’t follow wp forums advices telling you to rename your plugins folder, you will lose your time because not only it does not work (or seems to work for a while), but also that you will have to re-enable all your plugins one by one…
The reason of the problem is in fact very simple, it’s about memory limit !
To find it, the easier way is to modify your wp-config.php file and activate debug mode :
And to solve it, just rise your php memory limit and reload the page in error.
1) in the wp-config file :
2) if it does not work, modify your php.ini :
memory_limit = 128M ;
3) otherwise try to add an apache directive in your .htaccess file :
php_value memory_limit 128M
Don’t forget to set your WP_DEBUG back to false !