App crashes on close.

WINDOWS 10X64, LATEST VERSION. INTEL G3240+8GB DDR3+SSD

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> GLib.GException: Invalid filename
   at GLib.FileAdapter.Replace(String etag, Boolean make_backup, FileCreateFlags flags, Cancellable cancellable)
   at Pinta.Core.GtkExtensions.Replace(IFile file) in D:\a\Pinta\Pinta\Pinta.Core\Extensions\GtkExtensions.cs:line 289
   at Pinta.Core.PaintDotNetPalette.Save(List`1 colors, IFile file) in D:\a\Pinta\Pinta\Pinta.Core\PaletteFormats\PaintDotNetPalette.cs:line 66
   at Pinta.Core.Palette.Save(IFile file, IPaletteSaver saver) in D:\a\Pinta\Pinta\Pinta.Core\Classes\Palette.cs:line 190
   at Pinta.Core.PaletteManager.SaveCurrentPalette() in D:\a\Pinta\Pinta\Pinta.Core\Managers\PaletteManager.cs:line 184
   at Pinta.Core.PaletteManager.<.ctor>b__21_0(Object o, EventArgs e) in D:\a\Pinta\Pinta\Pinta.Core\Managers\PaletteManager.cs:line 87
   at Pinta.Core.SettingsManager.DoSaveSettingsBeforeQuit() in D:\a\Pinta\Pinta\Pinta.Core\Managers\SettingsManager.cs:line 106
   at Pinta.MainWindow.SaveUserSettings() in D:\a\Pinta\Pinta\Pinta\MainWindow.cs:line 497
   at Pinta.MainWindow.<OnActivated>b__6_2(Object <p0>, EventArgs <p1>) in D:\a\Pinta\Pinta\Pinta\MainWindow.cs:line 119
   at Pinta.Core.AppActions.RaiseBeforeQuit() in D:\a\Pinta\Pinta\Pinta.Core\Actions\AppActions.cs:line 67
   at Pinta.Actions.ExitProgramAction.Activated(Object sender, EventArgs e) in D:\a\Pinta\Pinta\Pinta\Actions\File\ExitAction.cs:line 61
   at Pinta.Core.Command.<.ctor>b__33_0(Object o, ActivatedArgs args) in D:\a\Pinta\Pinta\Pinta.Core\Actions\Command.cs:line 61
   at InvokeStub_ActivatedHandler.Invoke(Object, Object, IntPtr*)
   at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)
   --- End of inner exception stack trace ---
   at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at GLib.Signal.ClosureInvokedCB(Object o, ClosureInvokedArgs args)
   at GLib.SignalClosure.Invoke(ClosureInvokedArgs args)
   at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)