Upgrade Joomla and CPG can't login...

[gecekusu]

Upgrade joomla 1.0.10 to 1.0.12 and CPG can't login...

I try to login >>

(https://coppermine-gallery.com/forum/proxy.php?request=http%3A%2F%2Fimg291.imageshack.us%2Fimg291%2F3119%2Fscreenshot1lj2.jpg&hash=5cfe6ee380480dc85ce46a54716f4267717ae7ce)

then comes joomla login page>>

(https://coppermine-gallery.com/forum/proxy.php?request=http%3A%2F%2Fimg291.imageshack.us%2Fimg291%2F2097%2Fscreenshot2ke6.jpg&hash=9f4494137aed9938a48c92960665dc87590e922d)

I wanna login with my username and password.then comes joomla main page and try to login again and I can..

(https://coppermine-gallery.com/forum/proxy.php?request=http%3A%2F%2Fimg242.imageshack.us%2Fimg242%2F2590%2Fscreenshot3bc8.jpg&hash=b8769a755d73630f71d8cef9125e7ab5a54371ae)

coppermine install - http://www.cocktailshows.com/cpg
joomla install - http://www.cocktailshows.com

copeermine version: 1.4.10
joomla version: 1.0.12
CPG and Joomla test user account: tester/tester

thank you very much for your help