New install - broken message

Hi

I've had a go at installing Gallery3 several times but always end up with the same problem.

The Index page is loading okay with no galleries of course, but an admin login results in:

Dang... Something went wrong!
We tried really hard, but it's broken.
Talk to your Gallery administrator for help fixing this!

I've disabled my server root .htaccess as that can generate 403s but makes no difference.

The log entry (with real path removed) shows:

2012-11-03 15:18:22 +00:00 --- error: Kohana_Exception [ 403 ]: @todo FORBIDDEN
/home/..../modules/gallery/helpers/access.php [ 202 ]
#0 /home/..../modules/gallery/helpers/access.php(425): access_Core::forbidden()
#1 /home/..../modules/gallery/controllers/login.php(31): access_Core::verify_csrf()
#2 [internal function]: Login_Controller->auth_ajax()
#3 /home/..../system/core/Kohana.php(331): ReflectionMethod->invokeArgs(Object(Login_Controller), Array)
#4 /home/..../system/core/Event.php(208): Kohana_Core::instance(NULL)
#5 /home/..../application/Bootstrap.php(67): Event_Core::run(Array, Array)
#6 /home/..../index.php(113): require('/home/...')
#7 {main}
2012-11-03 15:18:22 +00:00 --- error: Missing messages entry kohana/core.errors.403 for message kohana/core

access.php at #0 has 644 and the helpers dir 755.

Thanks for any help.

Tony