I had to disable AddThis, as the site won't load with the upgrade to v2.4.0.
Hi Dirty Butter,
What theme and plugins are you running in addition to AddThis? Do you know what version of PHP your server has?
Using your question as a clue to the problem, I deactivated all plugins and then reactivated one at a time. The conflict was coming from Yoast's out of date Permalink redirect plugin.
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