"Oops! Page Not Found."

[jeremiah.holder]

My rewrite rule was set as "%slug%.html within the admin settings.

I am not sure how the .htaccess was changed, but I did not manually edit it prior to the "Oops!" error.

Thanks for the feedback, though.

none of plugins I know adds automatically a rewrite rule with .html suffix at the end of URL.
You had to do this manually, or you have overwritten .htaccess by a mistake.

btw. with such rewrite rule, you'd just have to add .html to custom link structure, ending with %parent%/%slug%.html