Error: Failed to update the setting

Hello, if I click on the create a column or create a row-button I get the error message: Failed to update the setting. What can I do? Thank you!

Hi
please give me an admin access by email, I will check that tomorrow
CEd

Thank you for your reply, but after generating a new style and editing the new style once, the error disappeared. But now I have another problem: The styles I edited are ignored partly in the frontend (eg: background colour works, font size and font colour not)

if you have the error again, please send me a screenshot of the page
please give me the url of your page with the menu so that I can check and send me a screenshot of hte settings ignored (a color for example)

I added a screenshot of both the backend and the menu - as you can see, the background is accepted (it is only red for better visibility btw.) while alle settings concerning the font (color, size, underline) are ignored.

the screenshot is a poor quality so I can not see very good
but I see :
- underline button is activated
- the text is underlined in the preview

so I don't understand when you say that this is ignored