Hi,
Thanks for all the responses. I tried disabling all plugins on the WP install, but the problem persists. 3 plugins could not be disabled however. I didn’t get any error, but when I deactivate them the page refreshes and they are still active.
They are:
Envato WordPress Toolkit
Revolution Slider
LayerSlider WP
Any ideas? WHat are the reasons why a plugin could not be deactivated?