AddThis

some options of addthis_config not working

I would like to customize the addthis toolbox via addthis_config.

Here is the html of the toolbox div:
<div addthis:email_template="Project" addthis:email_vars="{'project' : 'Testproject', 'description' : 'DSfsad'}" class="addthis_toolbox addthis_default_style">....</div>

Here are some params I set globally via addthis_config object literal:
window.addthis_config = {
'ui_cobrand': 'example.com',
'ui_window_panes' : 'true',
'data_track_clickback' : 'false',
'ui_use_addressbook' : 'true',
'services_exclude' : 'email, mailto, gmail'
}

None of these global options, except 'ui_window_panes', shows an effect at all. I also tried to use attributes on the toolbox div lik "addthis:services_exclude". But this did not change anything.

'data_track_clickback' seems to be working in some cases, but it does not work for gmail sharing for example.

How can this be fixed?