This may help someone else solve this problem.
On try to display the admin/content/node page, I found I was getting a completely blank page, with no HTML generated, and no log file. This occurred immediately after resetting the page content Filter.
My Apache log file showed the following error:
[client 84.9.xx.xx] PHP Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 231456 bytes) in /home/752/subdir/www.my-domain.com/public_html/modules/node/node.module on line 1628, referer: http://www.my-domain.com/admin/content/node
It seems that drupal simply ran out of server memory. Fortunately, the solution was simple, I added the following line to my .htaccess file (as described here):
php_value memory_limit 24M
This increased the available memory from 16M to 24M. This may solve the same problem when other page sometimes appear blank, and the content disappears.
See also: