Hello!
When I logging in to horde and trying to go to the inbox you either get a blank page or a pop-up to save mailbox.php (can also be sidebar.php or others), in plesk 9.5.
This happens with Plesk 9.5 after upgrade of http service, because the integration of plesk and other application like horde will not properly integrate with the http.
You can following in httpd configuration file “/etc/sysconfig/httpd”
Quote:
add export USE_ZEND_ALLOC=0
Restart httpd service after adding the above file.