The default shortcut for the Edit | Insert Hyperlink is Ctrl+Shift+L, which overrides the rich edit control shortcut. In the future, we'll change the default shortcut for that command to something else so it doesn't conflict. For now, remove that shortcut from that command (Tools | Customize | Keyboard, navigate to Edit | Insert Hyperlink, click the key assignment Ctrl+Shift+L and click Remove).
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