Modern SharePoint Online is buggy in some aspects. One of those being the themes. Out of nowhere, modern themes start giving errors – and waiting 24 hours doesn’t seem to solve it.
To fix it, go back to the classic themes and change it to something else. This will kickstart the modern themes again. Thanks to Andy Talbot for the heads up on this.
Views from Veronique 
I feel your pain Steve. It’s a never ending challenge for sure. Anything else you’re stuck with that we can help you with?
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“Modern SharePoint Online is buggy in some aspects” – that’s generous. I find it to be a uphill battle sloughing through reams of misinformation and idiotic design choices.
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The blog is quite precise and informative.
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