Yes… Disabled, but not uninstalled. Also, before wasting your time with a random issue, I’ve verified that at least 3 of my websites are having the same problem.
All three started having the problem, at the same time – after updating to the latest version, after updating to WordPress 3.8
All three have the same issue – the Google Authenticator code was working, prior to the update, and now, no longer works, even after deleting the plugin, via FTP, re-installing it, via WordPress Admin, regenerating the key and re-adding it to Google’s Authenticator app.
All three issue the same error:
ERROR: The Google Authenticator code is incorrect or has expired.