A few users on a wordpress site I manage got error messages when trying to reset a password via a link that was sent to them after submitting the "lost password" form. The error message stated the following: "Sorry, key does not appear to be valid."
I tested and also got the error message. However, the problem has now resolved and instead of getting the error message, an email is generated which gives me a new password to use for the site.
It's strange that the problem resolved on its own because no modifications were made to any of the site files in order to resolve this issue. I'm just wondering if anyone else has experienced these errors on 2.7 and up.