In reply to Steven Gliebe.

Well @M

1. You should never play "code monkey" on a production site. All your changes should be first tested on test enviroment, in which case it is actually much harder to move the changes to the production by the editor

2. You should never change the code of plugin and themes you have not wrote, as the next update will remove your changes.

3. The new feature actually have no way to predict what will WSOD some page on your site, it can just protect against bad syntax. But just being good syntax do not mean that your code will not break essential page like the cart page, or contact forms. Which is why point 1.

4. revert? I already know too much about wordpress code, I will try to avoid knowing what bad assumptions were done for this kind of feature. The only revert should be from your backup

5. If you need to modify several files together, you can't. You can only one by one which means your site is in unstable state during that time. If this unstable state can have an impact on how things are stored in the DB.... well I will wish you luck with recovering out of it.