Drupal 4.7.1
Apache 1.3.33
PHP 5.1.2
MySQL 5.0.18
Problem with anonymous users only. Anon users can view my drupal website initially and click on a few links, but then, upon clicking a varying number of links the screen goes blank, turns white. Usually no more than about 15 clicks. Manually entering and visiting various urls on the site, including the home page, all result in the same white page. Frequently, the screen goes white on the very first click after I have logged out as admin or as another user.
Manually dumping the cache with phpMyadmin resolves the problem temporarily. A few clicks around the site, and the problem happens again.
Deleting entries from the cache table one by one suggests that the offending entry consistently has these values: CID="some url" (not a system message) and expires="-1" Deleting a single entry resolves the access problem temporarily
I had the same problem with 4.7.0. Unfortunately the upgrade did not fix.
There don't seem to be any corresponding watchdog entries.
So, I went off in search of answers at drupal.org...
In response to suggestions in this message, http://drupal.org/node/63147
I can report that node_access table has a single line where gid="0" and view="1"
Also, I have not installed evaluation, taxonomy access, or organic groups modules.
In response to this message http://drupal.org/node/8054
I report that the user table has an entry where uid="0"