Hello Stephan Boehringer,
Sorry for late reply to this,
I have checked in your site, it seems like almost all the button/option can't able to click when i access your Easyblog write entry page, when i change to Joomla default template, everything is work except the "video embed button", pop-up the alert box.
May i know when you noticed this?
I'm suspect that is redirection issues, do you have install any 3rd party SEF component?
By the way, It looks like your account isn't tied up with any subscriptions on our site. Is there any mistake on our end? Would it be possible for you to contact us at
https://crm.stackideas.com and provide us with the order reference and your username so that we can fix this up for you?