Failing to open advanced-cache.php which is breaking Media Library

It looks like whatever the issue is has something to do with upgrading to 3.8 and Magic Fields V2 being up to date. I changed define(‘WP_CACHE’, true); to false, made sure WordPress was up to date, made sure Magic Fields V2 is up to date, no other plugins were active and there were no other PHP errors in my log or with WP_DEBUG. And suddenly it was fine. I re-activated everything and it’s been fine since.

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