Error when using Tagdiv Composer on drafted or published pages

Hi!

I have a fresh install of both WordPress and Newspaper. When i create a page i can edit it with Tagdiv composer at first if, but as soon as the page is saved as a draft or published I get the following error notification if editing with Tagdiv composer again: Error at zones: 6(models) : 1(dom). The model does not match the content Current state has involved an issue. You could try an UNDO operation (CTRL+Z / CTRL+SHIFT+Z).

Moreover, if I set a page as the site start page I can edit it with no problems. If I try to edit a drafted page the following error is displayed in the “Add new” view: Updating failed. Error message: The response is not a valid JSON response.

Installed plugins:

• Akismet Anti-Spam – inactive
• tagDiv Cloud Library
• tagDiv Composer
• tagDiv Social Counter
• tagDiv Standard Pack
• WP Super Cache – Same error before installing this plugin.

I have checked all Requirements for Newspaper and respected all relevant requirements, as well as the relevant point on the Tagdiv composer not working without any success. System status looks all green.

This is a completely new installation and I’m very surprised it doesn’t work out of the box. Any help is appreciated!