Index: lang/vb2005/Tween/Tween/Tween.vb
===================================================================
--- lang/vb2005/Tween/Tween/Tween.vb (revision 29552)
+++ lang/vb2005/Tween/Tween/Tween.vb (revision 29573)
@@ -845,4 +845,5 @@
             Dim lst As DetailsListView = DirectCast(tab.Controls(0), DetailsListView)
             Dim tabInfo As TabClass = _statuses.Tabs(tab.Text)
+            lst.BeginUpdate()
             If lst.VirtualListSize <> tabInfo.AllCount Then
                 If lst.Equals(_curList) Then
@@ -857,4 +858,5 @@
                 End If
             End If
+            lst.EndUpdate()
             If tabInfo.UnreadCount > 0 AndAlso tab.ImageIndex = -1 Then tab.ImageIndex = 0 'タブアイコン
         Next