Hi CAI,

We’re in the process of updating all Theme Dutch themes to WP 4.4., including compatability with third party plugins like Woocommerce, Gravity forms, Visual Composer etc. etc.
We don’t know which theme you are using right now (not mentioned in your post), but we strongly advice NOT to make any updates to your theme incl. plugins until we’ve released our updated theme. This can prevent issues in your current website.
As soon as your updated theme is available for download, we notify via Twitter, facebook and on the sales page of the theme’s marketplace.

Thanks for you patience in advance,