diff --git a/static/js/ace2_inner.js b/static/js/ace2_inner.js
index a90b2bd46..722a36cbd 100644
--- a/static/js/ace2_inner.js
+++ b/static/js/ace2_inner.js
@@ -2975,7 +2975,7 @@ function Ace2Inner(){
     return str.replace(/[\n\r ]/g, ' ').replace(/\xa0/g, ' ').replace(/\t/g, '        ');
   }
 
-  //FIXME: duplicated with contentcollector.js
+  //FIXME: duplicated with contentcollector.js ?
   var _blockElems = {
     //blocks and paragraphs
     "div": 1,
@@ -2986,6 +2986,8 @@ function Ace2Inner(){
     "ol": 1,
     "ul": 1,
     //titling styles
+    //fixme: they are blocks in this file but *not* in contentcollector.js
+    // => there times were I really feal like a hacker :s
     "h1": 1,
     "h2": 1,
     "h3": 1,
diff --git a/static/js/contentcollector.js b/static/js/contentcollector.js
index 0b730976c..25054cf7e 100644
--- a/static/js/contentcollector.js
+++ b/static/js/contentcollector.js
@@ -85,10 +85,12 @@ function makeContentCollector(collectStyles, browser, apool, domInterface, class
     "ol": 1,
     "ul": 1,
     //titling styles
-    "h1": 1,
-    "h2": 1,
-    "h3": 1,
-    "h4": 1,
+    //fixme: they actually *are* blocks but handling them as blocks breaks Drag&Drop
+    // => what is the real meaning of this structure ???
+    //"h1": 1,
+    //"h2": 1,
+    //"h3": 1,
+    //"h4": 1,
   };
 
   function isBlockElement(n)
@@ -185,10 +187,10 @@ function makeContentCollector(collectStyles, browser, apool, domInterface, class
     "ol": 1,
     "ul": 1,
     //titling styles
-    "h1": 1,
-    "h2": 1,
-    "h3": 1,
-    "h4": 1,
+    //"h1": 1,
+    //"h2": 1,
+    //"h3": 1,
+    //"h4": 1,
   };
 
   function _isEmpty(node, state)