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This issue hasn’t been reported before; in order to troubleshoot effectively, I would therefore need to ask for your website’s URL and admin login/password – you can send the information to support@satoristudio.net (no disclosure guaranteed).
I’ve looked into the issue – it seems that there was a reference in one of the theme’s included files which did not function properly in case of child themes. I’ve prepared a fix – please download this archive from my repository, unzip it, and upload into the following folder: /wp-content/themes/Ikebana/includes/easy-fancybox
replacing the existing file.