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This plugin is causing a problem on our site. We were having the same problem with WP Rocket as well. Users will sometimes (but not always) be unable to login to the site. They will be told their username is incorrect. Its weird though, because sometimes these users ARE logged in, but they can’t get past the login page unless they change the url to a specific page on the site. Sometimes new users can’t register either.
Login and registration is done through our core plugin called PeepSo, a social media plugin. PeepSo suggested just stop using on-site caching, but the site runs slow without it.
Any idea what specific setting could be causing this issue? The problem was happening when I had page cache, object cache, database cache, and browser cache enabled. Would one of these 4 settings be a more likely culprit?