Sometimes that happens. Keep the "Log me on automatically each visit" box checked.
Make sure you are using IE6 or IE7 beta, not AOL browser. phpBB uses sessions to keep track of users as they browse the board. These sessions use a combination of a unique session id and the users IP to identify each user. Unfortunately this only works when the users IP is constant as they browse the board. For most users this will be the case. However certain providers route their users via a cluster of proxys. In some cases, particularly AOL this results in different IPs being forwarded as the user moves between pages. We take account of this by not checking the entire IP but only the first "three quads". Again in most cases this will be fine. However again AOL uses IPs which can vary so much that checking only the first two quads results in a fairly static IP being available for session validation.
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