Tab Control Freezes after Interacting with Current Tab

Question

I have three tabs in my tab control that I can click through freely and everything works as planned. However, the second I interact with the current tab, the next couple tab changes locks up the tab control to the point where I cannot change a tab and forced to reopen the program. I have tried using custom tab controls, using a content presenter, and data templates but this tab control still locks.

Here is what it looks like normally:

Here is what it looks like when frozen:

---

This is my tab control in the view:

<controls:ViewModelToViewConverter x:Key="ViewViewModelConverter"/>
...

<TabControl SelectedIndex="{Binding SelectTabIndex, Mode=TwoWay}" >
  <TabItem x:Name="ApInvoicesTab" Header="AP Invoices" > 
     <ContentControl Content="{Binding CurrentViewModel, Converter={StaticResource ViewViewModelConverter}}"/>
   </TabItem>
   <TabItem x:Name="ArInvoicesTab" Header="AR Invoices" >
     <ContentControl Content="{Binding CurrentViewModel, Converter={StaticResource ViewViewModelConverter}}"/>
   </TabItem>
   <TabItem x:Name="HistoryTab" Header="History"> 
     <ContentControl Content="{Binding CurrentViewModel, Converter={StaticResource ViewViewModelConverter}}"/>
   </TabItem>
 </TabControl>

---

The converter:

public class ViewModelToViewConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null) return null;

        //use naming convention or custom settings here to get view type
        var viewModelType = value.GetType();
        var viewType = Type.GetType(value.ToString().Replace("Model", ""));

        var view = (FrameworkElement)Activator.CreateInstance(viewType);
        view.DataContext = value;
        return view;
    }
}

---

Main View Model (which is the datacontext for the main view with the tabs):

    //private properties
    private int _selectTabIndex;
    private ViewModelBase _currentViewModel;
    private List<ViewModelBase> _viewModels;


    //Constructor
    public MainViewModel()
    {
        try
        {
            _viewModels = new List<ViewModelBase>
            {
                new ApInvoiceViewModel(),
                new ArInvoiceViewModel(),
                new InvoiceHistoryViewModel()
            };

            PropertyChanged += MainViewModel_PropertyChanged;

            CurrentViewModel = _viewModels[0];
                ((IRefreshable)CurrentViewModel).RefreshData();
        }
        catch (Exception e)
        {

        }
    }

    //Command that displays correct viewmodel
    public RelayCommand<object> SetCurrentViewModelCommand
    {
        get
        {
            return _setCurrentViewModelCommand ?? (_setCurrentViewModelCommand = new RelayCommand<object>(
                      (getType) =>
                      {
                          try
                          {
                              if (getType != null)
                              {
                                  _messageService.ShowWorkingMessage();

                                  CurrentViewModel = _viewModels[(int)getType];

                                  if (CurrentViewModel is IRefreshable)
                                      ((IRefreshable)CurrentViewModel).RefreshData();

                                  _messageService.HideWorkingMessage();
                              }
                              IsLoading = false;
                          }
                          catch (Exception e)
                          {
                              IntegratorJobDAL.SetIntegratorJobError(0, e.ToString(), GetType().Name);
                              _messageService.ShowErrorMessage(e.Message);
                          }
                      }
                      ));
        }

    }


    //public properties and propertychanged
    private void MainViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName.Equals("SelectTabIndex"))
        {
            SetCurrentViewModelCommand.Execute(SelectTabIndex);
        }
    }

    public int SelectTabIndex
    {
        get { return _selectTabIndex; }
        set { Set("SelectTabIndex", ref _selectTabIndex, value); }
    }

    public ViewModelBase CurrentViewModel
    {
        get { return _currentViewModel; }
        set { Set("CurrentViewModel", ref _currentViewModel, value); }
    }