FWIW, I'm getting the "login recycle of doom" on the cruisecritic.com forum site, so it must be cookies/temp. internet files or browser issues as it's not just this board. I haven't bothered to try other browsers and do other such testing to isolate the problem, but it looks like it's not just the EE forum.

I've been going through all my LastPass saved passwords, duplicate entries and generating unique and secure passwords for a variety of sites, so I'm sure my browser feels like it's had the rug pulled out from under it with all these changes to sites I normally visit.

EDIT: although interestingly enough, while CC kept insisting that I needed to resubmit login information and wouldn't forward me off the login page, when I just went to the forum main page instead of submitting user/password, I was in fact logged in and everything was fine. Oh the joy of browsers!