Aksimet zia3-css-js = no visual editor in WP

Since the latest update of WP this problem occurs:

When both the Akismet and Zia3-css-js are activated the visual editor of wordpress only shows a blank box. When switching to text-editor and back, the post becomes visible, but you can not save any modifications.

When however only one of these two plugins is active, then all behaves normally.

https://www.ads-software.com/plugins/zia3-css-js/