Rhino WIP Repeating Crashes with Isolate objects

here is the crash report:
[ERROR] FATAL UNHANDLED EXCEPTION: System.InvalidOperationException: Cannot set Visibility or call Show, ShowDialog, or WindowInteropHelper.EnsureHandle after a Window has closed.
at System.Windows.Window.VerifyCanShow()
at System.Windows.Window.Show()
at Eto.Wpf.Forms.FormHandler.Show() in D:\BuildAgent\work\dujour\src4\DotNetSDK\Eto\src\Eto.Wpf\Forms\FormHandler.cs:line 43
at Rhino.UI.Controls.ToolTipControl.ShowFormNow()
at Eto.Forms.UITimer.OnElapsed(EventArgs e)
at Eto.Forms.UITimer.Callback.OnElapsed(UITimer widget, EventArgs e)
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
[END ERROR]

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