diff -r abe4697a1d0e -r 8d81f90f1d08 src/ztfy/myams/resources/js/myams.js
--- a/src/ztfy/myams/resources/js/myams.js	Thu Sep 01 15:18:16 2016 +0200
+++ b/src/ztfy/myams/resources/js/myams.js	Thu Sep 29 12:12:03 2016 +0200
@@ -2144,7 +2144,8 @@
 			if (viewport.exists()) {
 				var maxHeight = parseInt(viewport.css('max-height'));
 				var barWidth = $.scrollbarWidth();
-				if (viewport.height() === maxHeight) {
+				if ((viewport.css('overflow') !== 'hidden') &&
+					(viewport.height() === maxHeight)) {
 					$('<div></div>').addClass('scrollmarker')
 						.addClass('top')
 						.css('top', 0)