Index: src/corelibs/U2View/src/ov_sequence/GSequenceLineView.cpp
===================================================================
--- src/corelibs/U2View/src/ov_sequence/GSequenceLineView.cpp	(revision 2198)
+++ src/corelibs/U2View/src/ov_sequence/GSequenceLineView.cpp	(working copy)
@@ -89,6 +89,7 @@
     scrollBar->setDisabled(visibleRange.length == seqLen);
 
     connect(scrollBar, SIGNAL(valueChanged(int)), SLOT(sl_onScrollBarMoved(int)));
+    update();
 }
 
 int GSequenceLineView::getSingleStep() const {
@@ -449,7 +450,16 @@
     completeUpdate();
 }
 
+void GSequenceLineView::update() {
+    QWidget::update();
+    if (scrollBar->isEnabled()) {
+        scrollBar->setVisible(true);
+    } else {
+        scrollBar->setVisible(false);
+    }
+}
 
+
 //////////////////////////////////////////////////////////////////////////
 /// GSequenceLineViewRenderArea
 
Index: src/corelibs/U2View/src/ov_sequence/GSequenceLineView.h
===================================================================
--- src/corelibs/U2View/src/ov_sequence/GSequenceLineView.h	(revision 2198)
+++ src/corelibs/U2View/src/ov_sequence/GSequenceLineView.h	(working copy)
@@ -129,6 +129,7 @@
 
 public slots:
     void sl_centerPosition(int pos) {setCenterPos(pos);}
+    void update();
 
 protected slots:
     virtual void sl_onScrollBarMoved(int pos);