If there's one thing I tell people, it's to not update WordPress right when the update comes out. WordPress is notorious for having major bugs and conflicts with new versions. Typically they have to do with a plugin that hasn't been updated to work with the new version of WordPress, but sometimes, the issue goes much deeper.
For instance, my friends at the Double the Batch were having some major issues with their post editor. They could only edit in text mode, and they couldn't get the visual
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