I went into the settings and checked options in the three "Update Options" button on the "Buttons Group 1", "Buttons Group 2" and "Miscellaneous Features" groups. I then clicked the "update options" of the Miscellaneous features, and as a result, got a complete blank page and unavailable website. I can't even log back to my site at the moment. It seems like that action corrupted the whole WP install.
I would need help as soon as possible to get my site back online.