I fixed the issue by updating, but I could only update to that version after renewing the licenses, go figure.
Exact same problem here, every time a user tries to reset the password the link is invalid causing a neverending loop.
Fixed! Had our host (wpengine) remove all of the Ultimate member pages from being cached.
http://your-site.com/user/
http://your-site.com/account/
http://your-site.com/members/
http://your-site.com/register/
http://your-site.com/login/
http://your-site.com/logout/
http://your-site.com/password-reset/
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This reply was modified 6 years, 7 months ago by danteuton. Reason: Fixed the issue