White screen of death when uploading a file attachment I am currently experiencing a problem when adding file attachments to nodes in Drupal 6. When attaching a file and clicking the upload button, the screen goes white. I checked the files directory and the file does not appear there so it would seem it never gets uploaded. This problem occurs on the production server but not the test server. I have tried displaying php errors by modifying the index.php file but that does not display anything. I have the php memory set to 154MB but still no dice. I have Googled and searched this site but can't find a solution. Has anyone else experienced this problem? Can anyone provide some insight as to what the cause of this might be (and hopefully how to fix it)?

System setup

Ubuntu 10.4,
Apache,
PHP 5.3,
MySQL 5.1

Drupal 6.22,
CKK 6.x-2.9,
jQuery UI 6.x-1.5,
jQuery Update 6.x-2.0-alpha1,
plus a whole boatload of other modules (that may or may not be relevant).

Thanks for any possible insight into this.
mod_fcgid have to do with FastCGI.

There are actually a few PHP settings you may need to investigate and modify.

Reference: Increase upload size in your php.ini

In short though, you will need to up your upload_max_filesize as well as your post_max_size

Also, I would recommend watching your /var/log/apache2/error.log (Default location in Ubuntu 10.4) while debugging.  Generally running sudo tail -f /var/log/apache2/error.log will show you 'white screen' errors in real time.