Same here. Tried to operate the above settings, none of them worked.
Hope this will be fixed soon. 
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We’re still experiencing this issue at a community I manage. Hoping it will be fixed soon.
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I have still not worked out what I pressed that made mine work. It’s very frustrating. Let me see if I can restore a backup from a couple of weeks ago and rebreak my test site.
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I think there has been a breakthrough. 
By any chance, do you have PMs disabled for your system user?
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I believe this should be fixed by:
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Can confirm the issue is fixed on my instances now indeed. Thanks!
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