--- loncom/html/adm/LC_math_editor/src/ui.js	2015/02/25 20:54:06	1.3
+++ loncom/html/adm/LC_math_editor/src/ui.js	2017/01/05 13:55:35	1.4
@@ -156,7 +156,12 @@ var initEditors = function() {
                     var x = 0;
                     var y = 0;
                     while (el && !isNaN(el.offsetLeft) && !isNaN(el.offsetTop)) {
-                        x += el.offsetLeft - el.scrollLeft;
+                        var scrollLeft;
+                        if (el.nodeName == 'INPUT')
+                            scrollLeft = 0;
+                        else
+                            scrollLeft = el.scrollLeft;
+                        x += el.offsetLeft - scrollLeft;
                         y += el.offsetTop - el.scrollTop;
                         el = el.offsetParent;
                         if (el) {