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One thing to do when you get the WSOD is to turn on all error reporting to see what led up to the failure to produce output.  The error_reporting setting you show is turning of a lot of reporting.

You'll get more runtime error reporting by adding this to the start of settings.php on your site (you add it just below &lt;?php):

error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);


In addition, navigate to: Administration→ Configuration→ Development → logging and errors and select All messages. This sets $conf['error_level'] = 2;.

Also, check the logs (in particular most recent log messages).

If I should try to guess, I would say you're out of memory.  Having a 32M memory_limit when running Drupal 7 does sound like a source for trouble (I've no Drupal 7 site with less than 128M).