With Internet Explorer, when I try to login on phpmyvisites, I don't get an error message, but I'm redirected to the login page. I don't know what to do...

Check the following points
- maybe your webserver time is incorrect, for example maybe it is in the past. Check the date and time.
- check also your computer time and date.
- check that you don't have a Firewall or other 'security' software that may block the cookie phpmyvisites tries to set during the login process.