I upgraded the theme and upgraded the plugin of the visual composer.
Since then I can see my different content blocks in the dashboard, but the text blocks are not visible on my website.
Any idea what could be wrong?
If I add new text blocks they are also not shown.
Please update X to the latest version (4.4.2). Cornerstone will be installed automatically then for Visual Composer integrations to function properly. Also, if you have not validated X yet, please see https://community.theme.co/kb/product-validation/ for validation steps.