balancecharm

Hey guys, I was able to resolve the problem! The problem was caused by Yoast plugin (unfortunately, because I used to love it…) well, looks like we will have to wait till they make it compatible. After deactivating the Yoast plugin, make sure to flush the cache! @bob23894 thank you for the recommendation!!!

Hello, not sure why this thread was marked resolved. The initial problem “The tags do not work (you can’t add tags to the post, the window is there but it is not responsive) the settings tab is not responsive, the Yoast SEO window is there but it is blank and does not respond, also the screen options and help tabs at the upper right corner are not responsive either” that I have is still not resolved.
I tried to completely de-installing Yoast as recommended by @bob23894 but the problem is still there, only without Yoast. I am still able to make new posts or edit the existing ones, just without the tags and settings.

Hello, thank you very much everyone for your responses and suggestions. I have tried everything so far. The last thing I did, was re-install the WordPress 5.0. It said that I have Classic Editor activated (which is good), so there is no Gutenberg mentioned anywhere in the settings (which is normal according to Robert @bob23894).
When I edit an old post or create a new one, the editor window looks and works as usual.I can update or publish the post. But the main problem is still there, which is not working tabgs, unresponsive menu items, such as Screen Options, Help, Settings, Comments… I also have Yoast installed and that is also unresponsive. Not sure what else to do.

Hello everybody, thanks for your replies! I have tried to disabling all the plugins and switching to a default theme, the issue is still there. I have also tried to manually update the WordPress, but the issue is still there.
Now, when I tried Nelson2018 solution, I actually discovered another problem. Whenever I go to Settings > Writing, I do not even have any setting related to Gutenberg or Classic Editor… It only has an option to switch between the classic editor and block editor, nothing about Gutenberg.