always new login

[ofanan]

Hi,
I have installed actual cmsmadesimple successfully on a linux machine with xlampp running. When I log in as admin I see the main page with all links, but when I want to follow one of these links I will be redirected to the login-page. No way to administrate nothing.
Phpsession is enabled and works finally with other pages. Reinstall doesn't help.
Some help would be great, it's my first attempt with cmsystems.