Update: Issue persists for 8.0.7.9
--
Since two releases (and after upgrading to W 8.1 Pro x64 final) I'm getting an .NET error like this:

Main details from the error message:
System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
   bei DevExpress.XtraWaitForm.ProgressPanelViewInfo.get_ShouldDrawDescription()
   bei DevExpress.XtraWaitForm.ProgressPanelViewInfo.GetCaptionCorner(Graphics g)
   bei DevExpress.XtraWaitForm.ProgressPanelViewInfo.GetCaptionBounds(ControlGraphicsInfoArgs info)
   bei DevExpress.XtraWaitForm.ProgressPanelPainter.DrawCaption(ControlGraphicsInfoArgs info)
   bei DevExpress.XtraWaitForm.ProgressPanelPainter.DrawContent(ControlGraphicsInfoArgs info)
   bei DevExpress.XtraEditors.Drawing.BaseControlPainter.Draw(ControlGraphicsInfoArgs info)
   bei DevExpress.XtraEditors.BaseControl.OnPaint(PaintEventArgs e)
   bei System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
   bei System.Windows.Forms.Control.WmPaint(Message& m)
   bei System.Windows.Forms.Control.WndProc(Message& m)
   bei DevExpress.Utils.Controls.ControlBase.WndProc(Message& m)
   bei DevExpress.XtraEditors.BaseControl.WndProc(Message& msg)
   bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
************** Geladene Assemblys **************
mscorlib
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.34003 built by: FX45W81RTMGDR.
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll.
----------------------------------------
eXtreme Movie Manager
    Assembly-Version: 8.0.7.7.
    Win32-Version: 8.0.7.7.
    CodeBase: file:///C:/Program%20Files%20(x86)/eXtreme%20Movie%20Manager%208/eXtreme%20Movie%20Manager.exe.
----------------------------------------
Microsoft.VisualBasic
    Assembly-Version: 10.0.0.0.
    Win32-Version: 12.0.20806.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll.
----------------------------------------
System
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.34003 built by: FX45W81RTMGDR.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll.
----------------------------------------
System.Core
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll.
----------------------------------------
System.Windows.Forms
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll.
----------------------------------------
System.Drawing
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll.
----------------------------------------
System.Runtime.Remoting
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Remoting/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll.
----------------------------------------
System.Configuration
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll.
----------------------------------------
System.Xml
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll.
----------------------------------------
DevExpress.XtraEditors.v13.1
    Assembly-Version: 13.1.5.0.
    Win32-Version: 13.1.5.0.
    CodeBase: file:///C:/Program%20Files%20(x86)/eXtreme%20Movie%20Manager%208/DevExpress.XtraEditors.v13.1.DLL.
----------------------------------------
DevExpress.Utils.v13.1
    Assembly-Version: 13.1.5.0.
    Win32-Version: 13.1.5.0.
    CodeBase: file:///C:/Program%20Files%20(x86)/eXtreme%20Movie%20Manager%208/DevExpress.Utils.v13.1.DLL.
----------------------------------------
DevExpress.Data.v13.1
    Assembly-Version: 13.1.5.0.
    Win32-Version: 13.1.5.0.
    CodeBase: file:///C:/Program%20Files%20(x86)/eXtreme%20Movie%20Manager%208/DevExpress.Data.v13.1.DLL.
----------------------------------------
System.Data
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_32/System.Data/v4.0_4.0.0.0__b77a5c561934e089/System.Data.dll.
----------------------------------------
mscorlib.resources
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/mscorlib.resources/v4.0_4.0.0.0_de_b77a5c561934e089/mscorlib.resources.dll.
----------------------------------------
DevExpress.BonusSkins.v13.1
    Assembly-Version: 13.1.5.0.
    Win32-Version: 13.1.5.0.
    CodeBase: file:///C:/Program%20Files%20(x86)/eXtreme%20Movie%20Manager%208/DevExpress.BonusSkins.v13.1.DLL.
----------------------------------------
Microsoft.VisualBasic.resources
    Assembly-Version: 10.0.0.0.
    Win32-Version: 12.0.20806.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic.resources/v4.0_10.0.0.0_de_b03f5f7f11d50a3a/Microsoft.VisualBasic.resources.dll.
----------------------------------------
System.Windows.Forms.resources
    Assembly-Version: 4.0.0.0.
    Win32-Version: 4.0.30319.33440 built by: FX45W81RTMREL.
    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms.resources/v4.0_4.0.0.0_de_b77a5c561934e089/System.Windows.Forms.resources.dll.
----------------------------------------
The error doesn't prevent XMM from coming up after I confirm "continue" but it's still no fun.