By chance do you have wp-cache plugin installed? It has been known to cause this problem for some reason having to do with php5.
It could be a plugin problem or PHP memory. If you have not installed any plugin and getting blank page then PHP memory is an issue. Here are some workarounds to increase the value for PHP memory.
[1] You can contact your host to raise limit for php_memory.
[2] You can add following line in your .htaccess:
php_value memory_limit 64M
This will not work if suPHP is enabled on your server. If suPHP is enabled on your server then you will need to put php.ini in the root of your domain and modify the following line:
memory_limit = 64M ; Maximum amount of memory a script may consume (64MB)
[3] You can also raise PHP memory from wp-config.php file. Just add the following line after
define(’WP_MEMORY_LIMIT’, ‘64M’);
Kailash
