A search for solutions began and within hours developers discovered a bug in the page builder they all used. Sites Crashing After Updating To 6.4One of the first reports happened not long after WordPress 6.4, codenamed Shirley, was released. One of the first clues to the problem was that all the crashed sites had the Oxygen page builder installed. But that wasn’t the only thing users of the Oxygen page builder had in common. As admin in the official Oxygen Facebook group posted that they are looking into what is causing Oxygen sites to crash.