I have set up a new admin editor with limited rights in admin.
(they can manage albums and pages but cannot use options & theme editing areas)
Every time I try to login the screen just gives an error.
'There was an error logging in.
Check your username and password and try again. '

I checked the password in admin when logged in as superadmin.
When I click the checkbox, show password it is just blank.I have tried re-applying but it looks like 'apply' clears the password each time.
Any ideas what is going on here?
I am using Zenphoto version 1.4.5.7

I am not sure this is related to the admin login problem,
I also have a problem when I try to change the tinymce plugin
If I try to allocate default zenphoto editor to albums ( as zenpage had been accidentally selected) I get a
ERROR 500 - INTERNAL SERVER ERROR. I have checked with my web host and they think permissions are correct. 755 on folders, 644 on all files except a few in zp data have 600.

The only error I can see during setup.php is debug is enabled but I am not sure where I can disable this.

Resolved.
Just in case anyone else has similar proplems....
I am not sure what was wrong but removing .htaccess and re-running setup (so recreating .htaccess ) fixed the tinymce 500 error.
I still couldn't login with the new user account but password reset email seemed to fix that ( I couldn't see to do that beforehand though)

As always please review the error logs and post anything that might be related.