Suddenly I can no longer see the + New Topic button (when logged in as admin).
But as a normal user I see it.
Any ideas what happened?
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Yes, as admin I no longer see it on homepage or in category. I do see the reply button though.
Can you try in safe mode? Are any plugins third party plugins installed?
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How do I try that?
These I have installed:
discourse-adplugin
discourse-plugin-linkedin-auth
docker_manager
styleguide
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See this link safe-mode
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In safe mode the problem disappears 
So how do I know where the problem comes from and how to solve it?
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If in safe mode the problem disappears, then you’ll need to isolate the cause. Try re-entering safe mode and selecting only one of the safe mode options to see which one makes the problem disappear.
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Looks like we are getting there! With this the problem disappears: ?safe_mode=only_official
Which of my plugins are unofficial?
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Can you share a stripped down copy of your app.yml file? I specifically want to see the plugins listed there to see what is installed and where they are installed from.
Are you also sure that when you do /?safe_mode=no_custom the problem doesn’t disappear?
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When I do that, the problem disappears.
These I have installed:
discourse-adplugin
discourse-plugin-linkedin-auth
docker_manager
styleguide
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If this is the case, then it is most likely a theme issue, especially as all the plugins you’ve listed are official plugins. Check the customisations on your theme and also the theme components you have included on your theme, something there would be causing the issue.
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Strange, the problem also disappears when I just do: ?safe_mode=only_official
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