Hi,
On this page there's a GF loaded: http://www.eurofiber.com/events/kennissessie-big-data/
The problem is that at random page-loads the form is or is not displayed. It seems the style="display:none" in some cases is not removed by the script.
We've tried the steps that are provided in other threads: testing on plugin-conflicts and reverting the theme to a default, but none of these solutions are working.