This has been happening to my Drupal sites more and more frequently recently. Out of the blue - I get page not found errors. Typically on the front page, but sometimes only specific pages. Clearing the cache resolves the problem, but I'm thinking - what on earth is causing these page not found errors?
I examined the log files and was unable to come up with anything. I'm thinking maybe caching settings, since clearing the cache seems to fix the problem. And I don't recall having this issue with previous versions of Drupal (4.x, 5.x).
Is anyone else encountering this issue? Any suggestions?