Summary says most of it.
In 8u60 WebView updated their code to a newer version of QTWebKit. It turns out that some APIs are used there that apple considers "private" --
If you web search we can find many a QTWebKit thread talking about how to fix this. That, however, is for another bug. This is a "Fix it now" bug for packager.
To fix this, update packager to delete the webkit dylib (like we did with the QuickTime stuff). This makes it so webview cannot be used by Mac App Store apps. But this is better than breaking all web apps.