This isn't the usual "I can't log in" issue. A user is trying to log in on her copy of Chrome and cannot. She gets "Invalid username or password" errors every time. She then used Safari and it worked for a day, now it too won't let her log in. The same user account on a different computer works just fine. It applies to logging into the control panel and front end login forms. She says no other websites give login issues.
If that wasn't strange enough, other user accounts WORK!? It is just isolated to her username (her email address).
We cleared all the browsing data in Chrome and looked over the cookies to make sure there were not any for this site. Short of uninstalling Chrome and reinstalling it I'm not sure what else to do.
There are the usual fixes we tried: setting security to session ID or Cookies only, playing with the server's date settings, etc. Nothing worked.
To sum up: logging in with her username/password works on every computer but hers. Logging in on her computer with other usernames and passwords work.