If you place a TextBlock in the QuickAccessToolbar and the Ofice_Black theme is applied you get black foreground on black background which makes the text unreadable. The content of the QAT must respect the theme applied to the RadRibbonView control.

When you hit the Enter key and a number simultaneously the number is removed from the Value of the RadMaskedNumericInput

Workaround:
Handle the KeyDown event of the RadMaskedNumericInput control, when the Enter key is pressed.

private void INPUT_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Enter)
    {
        if (INPUT.Value.ToString().Length > 0)
        {
            RadWindow.Alert(INPUT.Value.ToString());
        }
        e.Handled = true;
    }
}

When exporting a document in a Silverlight project using the XamlFormatProvider an exception is thrown.

Missing StaticResource error (ScrollBarStyle) is thrown when using implicit styles and merging the Telerik.Windows.Controls.RichTextBoxUI.xaml file.

The tool does not found issues in a Silverlight project

You could repair the invalid file using the project from the attachment.

If the appearance is defined using a non-existing object reference in PDF document, NullReferenceException is thrown on import. 

In Expression Dark theme when you have a TextBlock inside a FluidContentControl the foreground is not updated.

When using a diagram in the theme Windows8, the all the text in the RadComboBox controls inside SettingsPaneTextControl is not showing.

Please see the attached file for example.

In a newly created empty Silverlight project, the Theme is set to Windows 8:

StyleManager.ApplicationTheme = new Windows8Theme();

Create a RadDiagram in a xaml file

<telerik:RadDiagram x:Name="diagram">
            <telerik:RadDiagramTextShape Content="Test" />
            <primitives:ItemInformationAdorner.AdditionalContent>
                <telerik:SettingsPane Diagram="{Binding ElementName=diagram}" />
            </primitives:ItemInformationAdorner.AdditionalContent>
        </telerik:RadDiagram>

And the text in the RadComboBox controls inside SettingsPaneTextControl is not visible.

most other themes work fine, but Window8 is not.

I already updated to the latest Telerik Silverlight libraries.

 

This reproduces only if the FlipDuration property of RadBook is set to 0. 

To work this around set the FlipDuration to a bigger value. For example: FlipDuration="0:0:0.001"

The items of the RadComboBox control in the SettingsPane Text tab are not visible when the Windows8 theme is applied using StyleManager.

Users want to be able to resize columns of RadPivotGrid at runtime, similar to RadGridView.

This feature is available with our latest official version - R1 2019.

The regular ComboBox goes through all of the starting with the same letter items when pressing the same key multiple times. RadComboBox currently always highlights the first one.
In addition, the case where starting to type couple letters, will select the matched item with StartsWith