I am a site admin (Drupal 7 - all updates are current) and am able to log in with my own credentials. I'm working an issue and need to log in as another non-admin user. No matter what I try, I'm not able to log in as this particular other user though I have verified their user email address and password. I have copied and pasted their email address directly from their user account. I have also reset their password so I know it is correct. I have tried turning off clean url's (as suggested by another forum), but that didn't help. I have cleared the site cache. I contacted the user and she is able to log in/out and back in with the exact same credentials I'm attempting to use. We have had this problem with another non-admin user on this particular site but it hasn't happened in quite a while and never with this user. I have logged in as this user prior to this happening but it has been a few months.
I saw another post on this site about the same thing but didn't really see a solution (Cannot log in to Drupal site).
Does anyone have any ideas? This is quite an inconvenience.