hello,
i would like to run zen photo in my web site. When i was install zenphoto everthing was ok. such a Systems Check was ok.
Now zenphoto is active, but when i'd like to login system i fill login and password then press login button therefore same login page again request me. No messege nothing just login page.

When i tried through in correct login or password i got message "Check your username and password and try again"

Anyway i can not pass login page please help me?

What version of zenphoto are you running? Did you upgrade from a previous version? If so, which. Also take a look at http://www.zenphoto.org/2007/12/troubleshooting-zenphoto/#16

i use zenphoto version 1.1.5 [1219]. Is not upgrade. New install. I tried your advice that in link. But nothing. When i try to use other hosting it was running successfuly.

Help please...

You said that "When i try to use other hosting it was running successfuly." Then it's apparently a problem of your host, maybe related to safe mode: http://www.zenphoto.org/2007/12/installation-and-upgrading/#5