diff --git a/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-debug.js b/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-debug.js
index 13cf88e8a1c..60490eae120 100644
--- a/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-debug.js
+++ b/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-debug.js
@@ -128,6 +128,9 @@ Y.extend(DIALOGUE, Y.Panel, {
         this.render();
         this.show();
         this.after('visibleChange', this.visibilityChanged, this);
+        if (config.center) {
+            this.centerDialogue();
+        }
         if (!config.visible) {
             this.hide();
         }
diff --git a/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-min.js b/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-min.js
index 6e81e7e538e..17172da75f1 100644
--- a/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-min.js
+++ b/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue-min.js
@@ -1 +1 @@
-YUI.add("moodle-core-notification-dialogue",function(e,t){var n,r,i,s,o,u,a,f;n="moodle-dialogue",r="notificationBase",i=0,s="yesLabel",o="noLabel",u="title",a="question",f={BASE:"moodle-dialogue-base",WRAP:"moodle-dialogue-wrap",HEADER:"moodle-dialogue-hd",BODY:"moodle-dialogue-bd",CONTENT:"moodle-dialogue-content",FOOTER:"moodle-dialogue-ft",HIDDEN:"hidden",LIGHTBOX:"moodle-dialogue-lightbox"},M.core=M.core||{};var l="Moodle dialogue",c,h,p,d,v;DIALOGUE_MODAL_CLASS="yui3-widget-modal",h=n+"-fullscreen",p=n+"-hidden",d="[role=dialog]",v="no-scrolling",c=function(t){i++;var n="moodle-dialogue-"+i;t.notificationBase=e.Node.create('<div class="'+f.BASE+'">').append(e.Node.create('<div id="'+n+'" role="dialog" aria-labelledby="'+n+'-header-text" class="'+f.WRAP+'"></div>').append(e.Node.create('<div id="'+n+'-header-text" class="'+f.HEADER+' yui3-widget-hd"></div>')).append(e.Node.create('<div class="'+f.BODY+' yui3-widget-bd"></div>')).append(e.Node.create('<div class="'+f.FOOTER+' yui3-widget-ft"></div>'))),e.one(document.body).append(t.notificationBase),t.additionalBaseClass&&t.notificationBase.addClass(t.additionalBaseClass),t.srcNode="#"+n,t.width=t.width||"400px",t.visible=t.visible||!1,t.center=t.centered||!0,t.centered=!1,t.COUNT=i,t.width==="auto"&&delete t.width,t.lightbox!==!1&&(t.modal=!0),delete t.lightbox,t.closeButton===!1?t.buttons=null:t.buttons=[{section:e.WidgetStdMod.HEADER,classNames:"closebutton",action:function(){this.hide()}}],c.superclass.constructor.apply(this,[t]),t.closeButton!==!1&&this.get("buttons").header[0].setAttribute("title",this.get("closeButtonTitle"))},e.extend(c,e.Panel,{_resizeevent:null,_orientationevent:null,initializer:function(t){var n;this.render(),this.show(),this.after("visibleChange",this.visibilityChanged,this),t.visible||this.hide(),this.set("COUNT",i),n=this.get("boundingBox"),t.extraClasses&&e.Array.each(t.extraClasses,n.addClass,n),t.visible&&this.applyZIndex()},applyZIndex:function(){var t=0,n,r;r=this.get("boundingBox"),this.get("zIndex")?r.setStyle("zIndex",this.get("zIndex")):(e.all(d).each(function(e){n=e.getStyle("zIndex"),n||(n=e.get("parentNode").getStyle("zIndex")),n&&(n=parseInt(n,10),n>t&&(t=n))}),t>0&&r.setStyle("zIndex",t+1))},toggleDocumentScrolling:function(){var t=e.one(e.config.doc.body),n=!0,r;r="."+h+", ."+DIALOGUE_MODAL_CLASS,e.all(r).each(function(e){e.hasClass(p)||(n=!1)}),e.UA.ie>0&&(t=e.one("html")),n?t.hasClass(v)&&t.removeClass(v):t.addClass(v)},visibilityChanged:function(t){var n;t.attrName==="visible"&&(this.get("maskNode").addClass(f.LIGHTBOX),t.prevVal&&!t.newVal&&(this._resizeevent&&(this._resizeevent.detach(),this._resizeevent=null),this._orientationevent&&(this._orientationevent.detach(),this._orientationevent=null)),!t.prevVal&&t.newVal&&(this.applyZIndex(),this.makeResponsive(),this.shouldResizeFullscreen()||this.get("draggable")&&(n="#"+this.get("id")+" ."+f.HEADER,this.plug(e.Plugin.Drag,{handles:[n]}),e.one(n).setStyle("cursor","move"))),this.get("center")&&!t.prevVal&&t.newVal&&this.centerDialogue(),this.toggleDocumentScrolling())},makeResponsive:function(){var t=this.get("boundingBox"),r;this.shouldResizeFullscreen()?(t.addClass(n+"-fullscreen"),t.setStyles({left:null,top:null,width:null,height:null}),r=e.one("#"+this.get("id")+" ."+f.BODY),r.setStyle("overflow","auto")):this.get("responsive")&&(t.removeClass(n+"-fullscreen").setStyles({overflow:"inherit",width:this.get("width"),height:this.get("height")}),r=e.one("#"+this.get("id")+" ."+f.BODY),r.setStyle("overflow","inherit"))},centerDialogue:function(){var t=this.get("boundingBox"),n=t.hasClass(p),r,i;if(this.shouldResizeFullscreen())return;n&&t.setStyle("top","-1000px").removeClass(p),r=Math.max(Math.round((t.get("winWidth")-t.get("offsetWidth"))/2),15),i=Math.max(Math.round((t.get("winHeight")-t.get("offsetHeight"))/2),15)+e.one(window).get("scrollTop"),t.setStyles({left:r,top:i}),n&&t.addClass(p)},shouldResizeFullscreen:function(){return window===window.parent&&this.get("responsive")&&Math.floor(e.one(document.body).get("winWidth"))<this.get("responsiveWidth")}},{NAME:l,CSS_PREFIX:n,ATTRS:{notificationBase:{},lightbox:{validator:e.Lang.isBoolean,value:!0},closeButton:{validator:e.Lang.isBoolean,value:!0},closeButtonTitle:{validator:e.Lang.isString,value:"Close"},center:{validator:e.Lang.isBoolean,value:!0},draggable:{validator:e.Lang.isBoolean,value:!1},COUNT:{value:0},responsive:{validator:e.Lang.isBoolean,value:!0},responsiveWidth:{value:768}}}),M.core.dialogue=c},"@VERSION@",{requires:["base","node","panel","event-key","dd-plugin"]});
+YUI.add("moodle-core-notification-dialogue",function(e,t){var n,r,i,s,o,u,a,f;n="moodle-dialogue",r="notificationBase",i=0,s="yesLabel",o="noLabel",u="title",a="question",f={BASE:"moodle-dialogue-base",WRAP:"moodle-dialogue-wrap",HEADER:"moodle-dialogue-hd",BODY:"moodle-dialogue-bd",CONTENT:"moodle-dialogue-content",FOOTER:"moodle-dialogue-ft",HIDDEN:"hidden",LIGHTBOX:"moodle-dialogue-lightbox"},M.core=M.core||{};var l="Moodle dialogue",c,h,p,d,v;DIALOGUE_MODAL_CLASS="yui3-widget-modal",h=n+"-fullscreen",p=n+"-hidden",d="[role=dialog]",v="no-scrolling",c=function(t){i++;var n="moodle-dialogue-"+i;t.notificationBase=e.Node.create('<div class="'+f.BASE+'">').append(e.Node.create('<div id="'+n+'" role="dialog" aria-labelledby="'+n+'-header-text" class="'+f.WRAP+'"></div>').append(e.Node.create('<div id="'+n+'-header-text" class="'+f.HEADER+' yui3-widget-hd"></div>')).append(e.Node.create('<div class="'+f.BODY+' yui3-widget-bd"></div>')).append(e.Node.create('<div class="'+f.FOOTER+' yui3-widget-ft"></div>'))),e.one(document.body).append(t.notificationBase),t.additionalBaseClass&&t.notificationBase.addClass(t.additionalBaseClass),t.srcNode="#"+n,t.width=t.width||"400px",t.visible=t.visible||!1,t.center=t.centered||!0,t.centered=!1,t.COUNT=i,t.width==="auto"&&delete t.width,t.lightbox!==!1&&(t.modal=!0),delete t.lightbox,t.closeButton===!1?t.buttons=null:t.buttons=[{section:e.WidgetStdMod.HEADER,classNames:"closebutton",action:function(){this.hide()}}],c.superclass.constructor.apply(this,[t]),t.closeButton!==!1&&this.get("buttons").header[0].setAttribute("title",this.get("closeButtonTitle"))},e.extend(c,e.Panel,{_resizeevent:null,_orientationevent:null,initializer:function(t){var n;this.render(),this.show(),this.after("visibleChange",this.visibilityChanged,this),t.center&&this.centerDialogue(),t.visible||this.hide(),this.set("COUNT",i),n=this.get("boundingBox"),t.extraClasses&&e.Array.each(t.extraClasses,n.addClass,n),t.visible&&this.applyZIndex()},applyZIndex:function(){var t=0,n,r;r=this.get("boundingBox"),this.get("zIndex")?r.setStyle("zIndex",this.get("zIndex")):(e.all(d).each(function(e){n=e.getStyle("zIndex"),n||(n=e.get("parentNode").getStyle("zIndex")),n&&(n=parseInt(n,10),n>t&&(t=n))}),t>0&&r.setStyle("zIndex",t+1))},toggleDocumentScrolling:function(){var t=e.one(e.config.doc.body),n=!0,r;r="."+h+", ."+DIALOGUE_MODAL_CLASS,e.all(r).each(function(e){e.hasClass(p)||(n=!1)}),e.UA.ie>0&&(t=e.one("html")),n?t.hasClass(v)&&t.removeClass(v):t.addClass(v)},visibilityChanged:function(t){var n;t.attrName==="visible"&&(this.get("maskNode").addClass(f.LIGHTBOX),t.prevVal&&!t.newVal&&(this._resizeevent&&(this._resizeevent.detach(),this._resizeevent=null),this._orientationevent&&(this._orientationevent.detach(),this._orientationevent=null)),!t.prevVal&&t.newVal&&(this.applyZIndex(),this.makeResponsive(),this.shouldResizeFullscreen()||this.get("draggable")&&(n="#"+this.get("id")+" ."+f.HEADER,this.plug(e.Plugin.Drag,{handles:[n]}),e.one(n).setStyle("cursor","move"))),this.get("center")&&!t.prevVal&&t.newVal&&this.centerDialogue(),this.toggleDocumentScrolling())},makeResponsive:function(){var t=this.get("boundingBox"),r;this.shouldResizeFullscreen()?(t.addClass(n+"-fullscreen"),t.setStyles({left:null,top:null,width:null,height:null}),r=e.one("#"+this.get("id")+" ."+f.BODY),r.setStyle("overflow","auto")):this.get("responsive")&&(t.removeClass(n+"-fullscreen").setStyles({overflow:"inherit",width:this.get("width"),height:this.get("height")}),r=e.one("#"+this.get("id")+" ."+f.BODY),r.setStyle("overflow","inherit"))},centerDialogue:function(){var t=this.get("boundingBox"),n=t.hasClass(p),r,i;if(this.shouldResizeFullscreen())return;n&&t.setStyle("top","-1000px").removeClass(p),r=Math.max(Math.round((t.get("winWidth")-t.get("offsetWidth"))/2),15),i=Math.max(Math.round((t.get("winHeight")-t.get("offsetHeight"))/2),15)+e.one(window).get("scrollTop"),t.setStyles({left:r,top:i}),n&&t.addClass(p)},shouldResizeFullscreen:function(){return window===window.parent&&this.get("responsive")&&Math.floor(e.one(document.body).get("winWidth"))<this.get("responsiveWidth")}},{NAME:l,CSS_PREFIX:n,ATTRS:{notificationBase:{},lightbox:{validator:e.Lang.isBoolean,value:!0},closeButton:{validator:e.Lang.isBoolean,value:!0},closeButtonTitle:{validator:e.Lang.isString,value:"Close"},center:{validator:e.Lang.isBoolean,value:!0},draggable:{validator:e.Lang.isBoolean,value:!1},COUNT:{value:0},responsive:{validator:e.Lang.isBoolean,value:!0},responsiveWidth:{value:768}}}),M.core.dialogue=c},"@VERSION@",{requires:["base","node","panel","event-key","dd-plugin"]});
diff --git a/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue.js b/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue.js
index 13cf88e8a1c..60490eae120 100644
--- a/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue.js
+++ b/lib/yui/build/moodle-core-notification-dialogue/moodle-core-notification-dialogue.js
@@ -128,6 +128,9 @@ Y.extend(DIALOGUE, Y.Panel, {
         this.render();
         this.show();
         this.after('visibleChange', this.visibilityChanged, this);
+        if (config.center) {
+            this.centerDialogue();
+        }
         if (!config.visible) {
             this.hide();
         }
diff --git a/lib/yui/dragdrop/dragdrop.js b/lib/yui/dragdrop/dragdrop.js
index 2f612208392..8dc4ba05ab2 100644
--- a/lib/yui/dragdrop/dragdrop.js
+++ b/lib/yui/dragdrop/dragdrop.js
@@ -35,7 +35,7 @@ YUI.add('moodle-core-dragdrop', function(Y) {
             // Listen for all drop:miss events
             Y.DD.DDM.on('drag:dropmiss', this.global_drag_dropmiss, this);
 
-            Y.on('key', this.global_keydown, window, 'down:space,enter,esc', this);
+            Y.on('key', this.global_keydown, window, 'down:32,enter,esc', this);
         },
 
         get_drag_handle: function(title, classname, iconclass, large) {
@@ -307,7 +307,8 @@ YUI.add('moodle-core-dragdrop', function(Y) {
             M.core.dragdrop.dropui = new M.core.dialogue({
                 headerContent : dialogtitle,
                 bodyContent : droplist,
-                draggable : true
+                draggable : true,
+                visible : true
             });
 
             // Focus the first drop target.
diff --git a/lib/yui/src/notification/js/dialogue.js b/lib/yui/src/notification/js/dialogue.js
index cd489a1374a..28d4729f4ad 100644
--- a/lib/yui/src/notification/js/dialogue.js
+++ b/lib/yui/src/notification/js/dialogue.js
@@ -97,6 +97,9 @@ Y.extend(DIALOGUE, Y.Panel, {
         this.render();
         this.show();
         this.after('visibleChange', this.visibilityChanged, this);
+        if (config.center) {
+            this.centerDialogue();
+        }
         if (!config.visible) {
             this.hide();
         }