I see the same error in my horde.log.
I have the default backends.php and the following backends.local.php 
(unchanged since Jan 17 2013)

<?
$backends['ftp']['disabled']=true;
$backends['sql']['disabled']=false;
$backends['sql']['name']='root';
?>

I have no backends.d directory nor a 10-webmail.php

In my gollem backends.local.php, I have:


$backends['ftp']['disabled'] = true;

$backends['file'] = array(
     // Disabled by default
     'disabled' => false,
     'name' => 'Virtual Home Directories',
     'driver' => 'file',
     'hordeauth' => true,
     'params' => array(
         // The base location under which the user home directories live.
         'vfsroot' => '/data/gollem/Horde_Gollem_Home/',
         // The default permissions to set for newly created folders and files.
         // 'permissions' => '750'
     ),
     'loginparams' => array(),
     'root' => '/' . $GLOBALS['registry']->getAuth(),
     'home' => '/' . $GLOBALS['registry']->getAuth(),
     'createhome' => true,
     // 'filter' => '^regex$',
     'quota' => '100 MB',
     'shares' => false,
     'attributes' => array(
         'type',
         'name',
         'edit',
         'download',
         'modified',
         'size',
     )
);

What *do* you have in your backends.local.php?

I found the cause for this error.  It appears that after the upgrade, 
somehow the upgrade process added a file inside my 
/horde/gollem/config/backends.d directory called 10-webmail.php and in 
it was:

<?php
$backends['ftp']['disabled'] = true;
$backends['sqlhome']['disabled'] = false;
$backends['sqlhome']['name'] = 'Home';

which caused the errors I reported.

I am not sure why this file was created since I don't run multiple 
vhosts.  I did have a backends.local.php file in the 
/horde/gollem/config directory however.

Removing the extra file created in the backends.d directory resolved 
the problem.

Thanks,

Hi,  Upgraded from webmail 5.1.3 to 5.1.4 (gollem 3.01 to 3.0.2) and 
now when a user goes to the login page, I get 3 of the following 
messages in my Horde log file:

WARN: HORDE [gollem] PHP ERROR: Invalid argument supplied for 
foreach() [pid 4888 on line 336 of 
"/data/www/horde/gollem/lib/Auth.php"]

I have made no changes to my backends.local.php file.  Even when I 
remove my backends.local.php file for Gollem, I continue to get the 
messages in the log when a login page is displayed.

My $conf[backend][backend_list] is set to 'none'

Thanks.