Please try to delete your cookies/temp files and check if the problem still exists.
To to this:
1.IE>Tools menu>Internet Options
2. General Tab> Browsing History section > Click Delete button.
3. Select Cookies(or all) and click Delete
1. Firefox>Tools menu
2. Click Clear Recent History - select Cookies (or all)
3. Click Clear Now or use Ctrl+Shift+Delete
Please run the following SQL script against your DB:
We'll need more time to investigate what's causing the issue. Meanwhile to fix it please this run the script below and delete your cookies
What version of Sitefinity are you using? This issue was fixed in a later release. Please run the script Sonya provided if you have not upgraded.
We are also facing the same login issue. We have followd all the suggestions said including clearing cache etc
we ran the scripts as suggested above and still couldnt make it.
We are using Sitefinety 6.1.
Can anyone please help in this regard.