Unhandled exception occurs when a custom localizer class is applied to ChartControl

After upgrading to 15.1.7 (from 15.1.6) I get an error (System.InvalidCastException) in the code below:

C#
void InitChartPaletteGallery(GalleryDropDown gallery)  
{  
    gallery.Gallery.DestroyItems();  
    string[] paletteNames = chartControl.GetPaletteNames();  
    gallery.Gallery.BeginUpdate();  
    for (int i = 0; i < paletteNames.Length; i++)  
    {  
        GalleryItem gPaletteItem = new GalleryItem();  
        gPaletteItem.Caption = paletteNames[i];  
        gPaletteItem.Hint = paletteNames[i];  
        gPaletteItem.Image = CreateEditorImage(chartControl.PaletteRepository[paletteNames[i]]);  
        gallery.Gallery.Groups[0].Items.Add(gPaletteItem);  
    }  
    gallery.Gallery.EndUpdate();  
    UpdateCurrentPalette();  
}  

The error comes on line 11 (CreateEditorImage) when the palletteNames[i] = "Black and White"  and i=2

Here is my Localizer Class:

C#
public class GenericChartLocalizer : ChartLocalizer  
{  
    public override string Language { get { return LocalizeDevExpress.TransLanguage; } }  
    public override string GetLocalizedString(ChartStringId id)  
    {  
        string str = base.GetLocalizedString(id);  
        if (MTDictionary.isInstanciated)  
        {  
            if (MTDictionary.Instance.DoTranslate(1))  
            {  
                str = MTDictionary.Instance.TranslateWord(1, str, this.ToString());  
            }  
        }  
        return str;  
    }  
}  

And here is how the localization is set:

C#
ChartLocalizer.Active = new GenericChartLocalizer();  

Error Details:
System.InvalidCastException was unhandled by user code
  HResult=-2147467262
  Message=Unable to cast object of type 'Maritech.Translator.Classes.GenericChartLocalizer' to type 'DevExpress.XtraCharts.Localization.ChartResLocalizer'.
  Source=DevExpress.XtraCharts.v15.1
  StackTrace:
       at DevExpress.XtraCharts.Localization.ChartLocalizer.GetDefaultString(ChartStringId id)
       at DevExpress.XtraCharts.Palettes.GetPalette(String name)
       at DevExpress.XtraCharts.Native.PredefinedPaletteList.get_Item(String name)
       at DevExpress.XtraCharts.PaletteRepository.GetPaletteByName(String name)
       at DevExpress.XtraCharts.PaletteRepository.get_Item(String name)
       at Maritech.Controls.Components.ChartAppearanceManager.InitChartPaletteGallery(GalleryDropDown gallery) in c:\TFS2010\Winforms\MaritechProducts\WiseAnalyzer\WiseAnalyzer5.0\Libraries\UserControls\MaritechControls\Components\DevExHelpers.cs:line 460
       at Maritech.Controls.Components.ChartAppearanceManager…ctor(GalleryDropDown paletteGallery, RibbonGalleryBarItem styleGalleryBarItem, BarButtonItem paletteButton) in c:\TFS2010\Winforms\MaritechProducts\WiseAnalyzer\WiseAnalyzer5.0\Libraries\UserControls\MaritechControls\Components\DevExHelpers.cs:line 345
       at NemoAnalyzer.AbstractForms.ChildForms.PivotForms.PivotBaseForm.InitChartObjects() in c:\TFS2010\Winforms\MaritechProducts\WiseAnalyzer\WiseAnalyzer5.0\NemoAnalyzer.AbstractForms\ChildForms\BaseForms\PivotBaseForm.cs:line 478
       at NemoAnalyzer.AbstractForms.ChildForms.PivotForms.PivotBaseForm.InitPivotAndChart() in c:\TFS2010\Winforms\MaritechProducts\WiseAnalyzer\WiseAnalyzer5.0\NemoAnalyzer.AbstractForms\ChildForms\BaseForms\PivotBaseForm.cs:line 237
       at NemoAnalyzer.AbstractForms.ChildForms.PivotForms.PivotBaseForm.PivotBaseForm_Load(Object sender, EventArgs e) in c:\TFS2010\Winforms\MaritechProducts\WiseAnalyzer\WiseAnalyzer5.0\NemoAnalyzer.AbstractForms\ChildForms\BaseForms\PivotBaseForm.cs:line 173
       at System.EventHandler.Invoke(Object sender, EventArgs e)
       at System.Windows.Forms.Form.OnLoad(EventArgs e)
       at DevExpress.XtraEditors.XtraForm.OnLoad(EventArgs e)
       at System.Windows.Forms.Form.OnCreateControl()
       at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
       at System.Windows.Forms.Control.CreateControl()
       at System.Windows.Forms.Control.WmShowWindow(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.Form.WmShowWindow(Message& m)
       at DevExpress.XtraEditors.XtraForm.WndProc(Message& msg)
       at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  InnerException: