Hi Bill,
Disabled all the plugins. Problem solved!
Found the the plugin that caused the problem:
Google Language Translator
Activeren | Bewerken | Verwijderen
The MOST SIMPLE Google Translator plugin. This plugin adds Google Translator to your website by using a single shortcode, [google-translator]. Settings include: layout style, hide/show specific languages, hide/show Google toolbar, and hide/show Google branding. Add the shortcode to pages, posts, and widgets.
Versie: 4.0.4 | Door Rob Myrick | Bezoek plugin site
Thank you very much for the super quick response and for poiting me into the right direction.
Super theme and super support!!
Thanks again,
Huub