I just realized that my shortcut to WPW forums was to the machine IP address rather than the domain name. I think it was that way because I couldn't reach the site during the update, and when it did load, the current address came up as the machine IP. I probably then saved it to Favorites again.
Interestingly, I just now added the IP address to IE's trusted sites, and 'log-in' now behaves normally. So maybe, IE rejects persistent cookies when the current page address is an IP number rather than domain name. It could consider an unresolved IP as a security risk.
I don't think there's a reason to chase this farther, but if you need me to just let me know.
Thanks Mike.
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