I can add a 5th user ID and password to the PPTP list in the usual way, but clicking the "Save settings" link at the bottom causes the router to reboot and the entry is not saved. (Navigating away without clicking "Save settings" doesn't cause a reboot, but the entry isn't saved, either.) I observed this with firmware 18.104.22.168 and also with 22.214.171.124, which is what I'm running now. I also cannot change the password of an existing user; same symptoms. I've tried this local to the router and also VPN'd in, using both Firefox and IE 6. Since I can't find reports of others having this problem, I'm obviously doing something wrong, and I'd surely appreciate a clue about that it might be! Thanks!