White Screen Even Though I Didn't Upgrade

[thunderclap82]

I was going to upgrade my forums from the latest 2.2 to 2.3.2. This screen popped up:



While I track down fixing the warnings (tracking down which php.ini Xenforo is using on my system has become more challenging than I expected), the site is now only giving a white screen. No upgrade has happened yet, just this check. How do I get the forum back?
White Screen Even Though I Didn't Upgrade

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