Hi Mike,
Downgrading PHP to v7.4 solved both problems. Thanks for your help.
Best regards.
Hi Yigit, The reason why I would really appreciate you to start looking into the first problem first – the error message I get when I press edit post/page/portfolio-item – is because this could be a sign that there is a bigger problem in the Enfold-code or in my Enfold-settings, resulting into a website-crash when I update to the latest Enfold-version. I also searched for a cause and looking for a solution in the Enfold support topics, but could not find anything about this. As you can see, I have no customizations and common plugins. I like proven software. I wish you a sharp eye :-).
I am very curious to your findings on both problems. Could you please investigate them and informe me about your findings, before you update the theme to 4.8.6.4?