I've been noticing some strange behavior, and I'm not sure if it is the same problem many 4.7 users were experiencing. I found a thread which seems to touch on the topic, but there was never a real conclusion to the thread. http://drupal.org/node/110478

If I'm logged in to my site, I notice that when I go to certain pages or links, I'll be logged out. But as soon as I click back, or to other pages I'm logged in again. I can only duplicate the problem while browsing with Firefox. Shockingly enough, there doesn't appear to be a problem while browsing with IE.

I'm using Drupal 5.1 with MySQL 4.1.21 and PHP 5.2.2. Has anybody else had this problem?