I don’t know what happened but the links in the section “Recent News” at the “Welcome to PlatformIO” start screen doesn’t work any more. There is no reaction by clicking them. What went wrong? Any hint is always welcome!

That simply means that links from the Home Tab doesn’t work. The articles shown in the Home-Tab are just articles from PlatformIO’s LinkedIn account. You can find the articles here: PlatformIO Labs | LinkedIn But clicking these articles in the Home-Tab currently doesn’t work.