Created attachment 818383 [details] mdn-error.png Quite often when I save a page, KumaScript throw the following error : "Unexpected response from Kumascript service: 204"
This appears to be related to bug 927948. The app servers were responding to requests slowly, which could be related to these kumascript failures. We've restarted the app servers and resolved the general site slowness. Let us know if that resolved this bug, too.