Plesk 11.5 CentOs 6.4 Horde error, can't compose message

[GunnarL]

Hi,

I ran an update on the weekend to latest Plesk (11.5.30 Update #25) version. Now customers are complaining that
they can't compose messages in webmail. The pop up window remains empty

Url for pop up window is: http://webmail.customerdomain.tld/imp/dynamic.php
Console shows following error: Uncaught TypeError: Cannot call method 'insert' of null

The error happens here:

   addPopdown: function(p, t, o)
    {
        o = o || {};

        var elt = new Element('SPAN', { className: 'horde-popdown' }),
            ins = {};
        p = $(p);

        ins[o.insert ? o.insert : 'after'] = elt;
        p.insert(ins);

Any ideas how to fix it?

Thanks,

Gunnar

p.s php version is 5.3.3.

 

[IgorG]

Any additional details from /var/log/psa-horde/psa-horde.log ?

 

[GunnarL]

No, file is empty

Any additional details from /var/log/psa-horde/psa-horde.log ?