Storyline 3 - An error while changing the player size in an existing prject. - error number UTF-16

Hello,

When changing the player size from "lock" to "scale" i get the following error when closing the player window.

when changing the player size in a new project, ti works fine.

thank you in advance.

<?xml version="1.0" encoding="utf-16"?>
<ErrorReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<UserId />
<HardwareId>TVDUU-PQ8H9-JRNGQ-9RP33-FUTUA</HardwareId>
<Message>Object reference not set to an instance of an object.</Message>
<StackTrace> at void Articulate.Design.UI.PlayerProperties.PlayerOtherTab.SaveData()
at void Articulate.Design.UI.PlayerProperties.PlayerMiscTab.SaveData()
at void Articulate.Design.UI.PlayerProperties.PlayerPropertiesDialog.SaveData()
at bool Articulate.Design.UI.PlayerProperties.PlayerPropertiesDialog.ShowPlayerProperties(IPlayersFactory playersfactory, IList&lt;CustomPlayerPropertiesTab&gt; CustomTabs, bool focusTitle)
at bool Articulate.Design.UI.PlayerProperties.PlayerPropertiesDialog.Show(IPlayersFactory playersfactory, bool focusTitle)
at void Articulate.Storyline.Commands.RibbonPlayerPropertiesCommand.OnExecute(object[] values)
at async Task Articulate.Windows.Forms.CommandBase.a(object[] A_0)
at void Articulate.TaskExtensions.ExecuteAndForceExceptionsToForeground(Task task, bool runAsync)
at void Articulate.Windows.Forms.CommandBase.Execute(object[] values)
at void Articulate.Windows.Forms.Ribbon.RibbonButton.ExecuteCommand()
at bool Articulate.Windows.Forms.Ribbon.RibbonButton.OnActivate(ActivateEventArgs e)
at void Divelements.SandRibbon.WidgetBase.PerformActivate(ActivateEventArgs e)
at void Articulate.Windows.Forms.Ribbon.RibbonButtonBase.OnMouseUp(MouseEventArgs e)
at void Articulate.Windows.Forms.Ribbon.RibbonButton.OnMouseUp(MouseEventArgs e)
at void Divelements.SandRibbon.ParentWidgetBase.OnMouseUp(MouseEventArgs e)
at void Divelements.SandRibbon.ParentWidgetBase.OnMouseUp(MouseEventArgs e)
at void Divelements.SandRibbon.RibbonTab.OnMouseUp(MouseEventArgs e)
at void Articulate.Windows.Forms.Ribbon.RibbonTab.OnMouseUp(MouseEventArgs e)
at void System.Windows.Forms.Control.WmMouseUp(ref Message m, MouseButtons button, int clicks)
at void System.Windows.Forms.Control.WndProc(ref Message m)
at void Divelements.SandRibbon.SandRibbonControlBase.WndProc(ref Message m)
at void Articulate.Windows.Forms.Ribbon.RibbonTab.WndProc(ref Message m)
at void System.Windows.Forms.Control+ControlNativeWindow.OnMessage(ref Message m)
at void System.Windows.Forms.Control+ControlNativeWindow.WndProc(ref Message m)
at IntPtr System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, int msg, IntPtr wparam, IntPtr lparam)</StackTrace>
</ErrorReport>