I'm trying to track down an issue with a PHP 'white screen of death', which isn't generating any visible log entries. I'm guessing it's either a permissions or memory issue. I'm on shared hosting, with no shell access. I've overridden the php error log in .htaccess, and confirmed with phpinfo that it's working, but getting nothing there. There's nothing showing up in any of the Magento logs. I do have access to a couple of logs covering the entire webspace, but not sure if they're showing everything. Is there any way of overriding the apache error log from within .htaccess?