I have a big issue with the customization feature : 

1. CSS

Everything are up to date on Preview and  https://deskportal.zoho.com/portal/<myname>

But nothing happen in mysubdomain.mydomain.com/portal

2. Tabs configuration is ignored

I turned off some tabs but the configuratio is ignored in preview reloaded after publish confirmation.

And nothing happen in mysubdomain.mydomain.com/portal nor https://deskportal.zoho.com/portal/<myname>

Thanks for your help !!