Try changing webmail to 'system default' on every domains and then run 'sh /script/fixweb; sh /script/restart-services'.
i try to reinstall and change php to php53u, horde and roundcube work good but aferlogic and squirrelmail can not login, and T-Dah can login but when try to sent mail I got error "It was not possible to send this Email, Check the Address and Try again. SMTP Error: Could not connect to SMTP host."
then I change back to php54, the problem before came again
new sysinfo
A. Kloxo-MR: 6.5.0.c.2013022706
B. OS: CentOS release 6.3 (Final) i686
C. Apps:
1. MySQL: mysql-5.5.29-1.el6.i686
2. PHP: php54-5.4.11-1.ius.el6.i686
3. Httpd: httpd-2.2.23-1.el6.i686
4. Lighttpd: --uninstalled--
5. Nginx: nginx-1.3.13-1.el6.i686
6. Qmail: qmail-toaster-1.03-1.3.22.mr.el6.i686
7. Dns: bind-9.9.2-2.P1.el6.i686
D. Php-type (for Httpd/proxy): php-fpm_event
I thought maybe the problem with the database connection, I try 'yum list php*-mysql*' it turns out the package php54-mysql is not installed. Is this source of the problem?