The exception is fixed. To evaluate the IsReadOnlyBinding of the column, we do not use the built-in binding mechanism but a custom one. This custom binding mechanism is designed to use as a source only the default one which is the current item of the ItemsSource of RadGridView. This is the reason that the scenario where the default source of the binding is changed is not supported by design. 

Available in LIB version 2017.1.213 , it will be also available in the R1 2017 SP1 Release.

Available in LIB version: 2017.2.515

Available in LIB version 2016.3.1212, it will be also available in the 2017 R1 release.

If in the content of RadGridView.ControlPanelItem has a binding with a RelativeSource or ElementName and the grid is placed in the collapsed UserControl, a binding error is thrown in the output window.

Available in LIB version 2016.3.1309 , it will be also available in the 2017 R1 release.

The default merging algorith merges adjacent cells with the same value. An option for preventing cells merging despite their value, should be provided.

Available in LIB version 2016.3.1227, it will be also available in the 2017 R1 release.

Version 2016.3.1024.45 (from nuget packages, if that matters)
Adding a new row with the "Add new row" button and then clicking the row indicator results in an extra row. Demo: http://recordit.co/Nn8y2z2YpI

Available in the R1 2017 SP1 Release.

An exception with the following StackTrace is thrown:

       at System.Windows.Threading.Dispatcher.VerifyAccess()
       at System.Windows.DependencyObject.GetValue(DependencyProperty dp)
       at Telerik.Windows.Data.FilterDescriptor`1.get_FilteringExpression()
       at Telerik.Windows.Data.FilterDescriptor`1.CreateFilterExpression(ParameterExpression parameterExpression)
       at Telerik.Windows.Data.FilterDescriptorBase.CreateFilterExpression(Expression instance)
       at Telerik.Windows.Data.Expressions.FilterDescriptorCollectionExpressionBuilder.CreateBodyExpression()
       at Telerik.Windows.Data.Expressions.FilterExpressionBuilder.CreateFilterExpression()
       at Telerik.Windows.Data.QueryableExtensions.Where(IQueryable source, CompositeFilterDescriptorCollection filterDescriptors)
       at Telerik.Windows.Data.QueryableCollectionView.CreateView()