Usually simply spelling errors are caught and displayed with gentle errors, but every now and then a single character and inspire debugging insanity. I just made such a mistake while moving a drupal site from http://www.example.com/drupal to http://subdomain.example.com.
I misspelled the $base_url for my site (I know, I know, it’s the only thing I had to change). The weird thing was that nothing showed up in any apache/php log, and all the pages, and the POSTs even went through, but after the POSTs I was redirected to a blank page rather than the proper destination. Very confusing.
All the Drupal documentation about ‘The White Screen of Death’ pointed to memory limits, bad modules, caches, etc, none of which seemed applicable. So an hour and one character later, we are up and running. Hth.
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