[imp] Unstable behaviour. Sometimes oK sometimes not.

[mbneto]

Hi,

I keep getting the following error:

HORDE [emergency] [imp] DB Error: not found: Unable to include the DB/.php
file for 'Array' [on line 393 of
"/var/www/html/horde/lib/Horde/Prefs/sql.php"]

And

$conf['prefs']['params']['charset']. [on line 525 of
"/var/www/html/horde/lib/Horde.php"]

When I try to login.   But if I reload I can access the webmail even tough
Horde's menu appears at the left side.

Any ideas?

horde-3.1.2, imp-h3-4.1.2 and turba-h3-2.1.1
php 5.0.4, Centos 4.3