Log in glitch - known bug

I am working to resolve a glitch that sometimes causes users to have to attempt to log in two or more times before the log in is successful. I have not been able to track down the source of the glitch, but in the meantime, please be aware that I am aware of the problem. Best advice... please try again. And email me if you continue to be unable to log in.

Any Drupal wizards out there who may know something about the log in issue, please feel free to offer suggestions