Storyline 360 crash too much !

I am unable to use a restulat slide in storyline after a bank of questions because any modification causes storyline to crash.

I tried to use a quizmaker to insert a question slide and even with that the rest slide crashes story line.

I tried to uninstall storyline, reboot, reinstall storyline but always a bug crashing ! Please Help me ! this period is very important to use storyline instead of creating face to face learning path !

here is the eventviewer

Application Error : 

Nom de l’application défaillante Storyline.exe, version : 3.39.21985.0, horodatage : 0x5e99c984
Nom du module défaillant : KERNELBASE.dll, version : 10.0.18362.778, horodatage : 0x692cf0ab
Code d’exception : 0xe0434352
Décalage d’erreur : 0x00114192
ID du processus défaillant : 0x261c
Heure de début de l’application défaillante : 0x01d61a28145f03fd
Chemin d’accès de l’application défaillante : C:\Program Files (x86)\Articulate\360\Storyline\Storyline.exe
Chemin d’accès du module défaillant: C:\Windows\System32\KERNELBASE.dll
ID de rapport : 55f7ca74-378a-4500-bdf6-132ce596fb91
Nom complet du package défaillant :
ID de l’application relative au package défaillant :

.net Runtime : 

Application : Storyline.exe
Version du Framework : v4.0.30319
Description : le processus a été arrêté en raison d'une exception non gérée.
Informations sur l'exception : System.InvalidOperationException
à System.Linq.Enumerable.Max(System.Collections.Generic.IEnumerable`1<Int32>)
à Articulate.Storyline.Triggers.Internal.View.LineView+<>c.<CalculateSize>b__23_0(System.Collections.Generic.IList`1<Articulate.Storyline.Triggers.Internal.View.BlockView>)
à System.Linq.Enumerable+WhereSelectListIterator`2[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].MoveNext()
à System.Linq.Enumerable.Sum(System.Collections.Generic.IEnumerable`1<Int32>)
à Articulate.Storyline.Triggers.Internal.View.LineView.CalculateSize()
à Articulate.Storyline.Triggers.Internal.View.LineView.Measure(System.Drawing.Graphics)
à Articulate.Storyline.Triggers.Internal.View.TriggerClassicItemView+<>c__DisplayClass5_0.<Measure>b__0(Articulate.Storyline.Triggers.Internal.View.LineView)
à Articulate.Collections.Generic.EnumerableExtensions+d[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].b(System.__Canon, Int32)
à Articulate.Collections.Generic.EnumerableExtensions.ForEach[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]](System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Action`2<System.__Canon,Int32>)
à Articulate.Collections.Generic.EnumerableExtensions.ForEach[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]](System.Collections.Generic.IEnumerable`1<System.__Canon>, System.Action`1<System.__Canon>)
à Articulate.Storyline.Triggers.Internal.View.TriggerClassicItemView.Measure(System.Drawing.Graphics)
à Articulate.Storyline.Triggers.Internal.View.TriggerObjectGroup+<>c__DisplayClass98_0.<InitializeMeasurements>b__0(Articulate.Storyline.Triggers.Internal.View.ITriggerObjectGroupChildView)
à System.Collections.Generic.List`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].ForEach(System.Action`1<System.__Canon>)
à Articulate.Storyline.Triggers.Internal.View.TriggerObjectGroup.InitializeMeasurements(System.Windows.Forms.Control, System.Collections.Generic.List`1<Articulate.Storyline.Triggers.Internal.View.ITriggerObjectGroupChildView>)
à Articulate.Storyline.Triggers.Internal.View.TriggerObjectGroup+<>c__DisplayClass88_0.<.ctor>b__2()
à System.Lazy`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].CreateValue()
à System.Lazy`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].LazyInitValue()
à System.Lazy`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].get_Value()
à Articulate.Storyline.Triggers.Internal.View.TriggerObjectGroup.get_ChildViews()
à Articulate.Storyline.Triggers.Internal.View.TriggerObjectGroup.MeasureHeight()
à Articulate.Storyline.Triggers.Internal.View.TriggerObjectGroup..ctor(Int32, Articulate.Storyline.Triggers.Internal.View.TriggersList, Articulate.Storyline.Triggers.Internal.ViewModel.ISelection, Articulate.Storyline.Triggers.Internal.ViewModel.IObjectGroup, Articulate.Storyline.Triggers.Internal.ViewModel.TriggerItemAdornerViewModel, Articulate.Storyline.Triggers.Internal.ViewModel.ITriggerGroupManager, Articulate.Storyline.Triggers.Internal.ViewModel.ITriggersMultiSelect, Articulate.Storyline.Triggers.Internal.ViewModel.ISelectionSynchronizer, Articulate.Storyline.Triggers.Internal.ViewModel.ITriggersUndoManager, Articulate.Model.IAnalytics)
à Articulate.Storyline.Triggers.Internal.View.TriggersList.CreateGroups()
à Articulate.Storyline.Triggers.Internal.View.TriggersList.LoadGroups()
à Articulate.Storyline.Triggers.Internal.View.TriggersList.<OnTriggerGroupManagerOnRebuilt>b__39_0()
à Articulate.Windows.Forms.ControlsExtensions.InvokeIfRequired(System.Windows.Forms.Control, System.Action)
à Articulate.Storyline.Triggers.Internal.View.TriggersList.OnTriggerGroupManagerOnRebuilt()
à Articulate.Storyline.Triggers.Internal.View.TriggersList.<Initialize>b__21_0(System.Reactive.Unit)
à System.Reactive.AnonymousObserver`1[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNextCore(System.Reactive.Unit)
à System.Reactive.ObserverBase`1[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Observer`1[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Subjects.Subject`1[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à Articulate.Storyline.Triggers.Internal.ViewModel.TriggerGroupManager.Rebuild(Articulate.Design.SlideBase)
à Articulate.Storyline.Triggers.Internal.ViewModel.TriggerGroupManager.<.ctor>b__34_8(System.Reactive.Unit)
à System.Reactive.AnonymousSafeObserver`1[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Linq.ObservableImpl.Merge`1+_+Iter[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Linq.ObservableImpl.Merge`1+_+Iter[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Linq.ObservableImpl.Merge`1+_+Iter[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Linq.ObservableImpl.Merge`1+_+Iter[[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.Reactive.Unit)
à System.Reactive.Linq.ObservableImpl.Select`2+_[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Reactive.Unit, System.Reactive.Core, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263]].OnNext(System.__Canon)
à System.Reactive.Linq.ObservableImpl.Where`1+_[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnNext(System.__Canon)
à System.Reactive.Observer`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnNext(System.__Canon)
à System.Reactive.Subjects.Subject`1[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]].OnNext(System.__Canon)
à rz.Dispatch[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]](System.__Canon)
à Articulate.ApplicationDispatcher.Messages.Dispatch[[System.__Canon, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]](System.__Canon)
à Articulate.Design.ProjectFile.OnBatchOperationDone(Articulate.Design.BatchOperationEventArgs)
à Articulate.Design.Project.NotifyBatchOperationDone(Articulate.Design.BatchOperation)
à Articulate.Design.BatchOperation.DisposeManagedResources()
à Articulate.DisposableBase.Dispose(Boolean)
à Articulate.DisposableBase.Dispose()
à Articulate.Design.Commands.DeleteCommand.OnExecute(System.Object[])
à Articulate.Storyline.Commands.DeleteCommand.OnExecute(System.Object[])
à Articulate.Windows.Forms.CommandBase+b.e()
à System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
à Articulate.TaskExtensions.ExecuteAndForceExceptionsToForeground(System.Threading.Tasks.Task, Boolean)
à Articulate.Windows.Forms.CommandBase.Execute(System.Object[])
à Articulate.Windows.Forms.CommandBase.Call(System.Object, System.Object[])
à Articulate.Windows.Forms.CommandShortcutListener.ShortcutActivated(System.Windows.Forms.Keys)
à Articulate.Windows.Forms.CommandShortcutListener.PreFilterMessage(System.Windows.Forms.Message ByRef)
à System.Windows.Forms.Application+ThreadContext.ProcessFilters(MSG ByRef, Boolean ByRef)
à System.Windows.Forms.Application+ThreadContext.PreTranslateMessage(MSG ByRef)
à System.Windows.Forms.Application+ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FPreTranslateMessage(MSG ByRef)
à System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
à System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
à System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
à Articulate.Storyline.Program.Main(System.String[])