Copy/Paste error - "Requested clipboard operation did not succeed"

I get this in all versions...

<SDLErrorDetails time="4/6/2017 10:55:44 AM">
  <ErrorMessage>Requested Clipboard operation did not succeed.</ErrorMessage>
  <Exception>
    <Type>System.Runtime.InteropServices.ExternalException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <ErrorCode>-2147221040</ErrorCode>
    <HelpLink />
    <Source>System.Windows.Forms</Source>
    <HResult>-2147221040</HResult>
    <StackTrace><![CDATA[   at System.Windows.Forms.Clipboard.ThrowIfFailed(Int32 hr)
   at System.Windows.Forms.Clipboard.SetDataObject(Object data, Boolean copy, Int32 retryTimes, Int32 retryDelay)
   at Sdl.DesktopEditor.Control.ClipboardAccess.Set(IDocumentFragment iDocFragment)
   at AbstractFrameworkEditControl.CopySelectionToClipboard()
   at Sdl.TranslationStudio.Editor.TranslationEditor.SideBySideDocumentEditingView.Copy()
   at Sdl.TranslationStudio.Editor.TranslationEditor.SideBySideDocumentEditingView.CopyActionHandler.Execute()
   at Sdl.Desktop.Platform.CommandBars.RetargetableAction.Execute()
   at Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.<>c__DisplayClass3.<ExecuteAction>b__2()
   at Sdl.Desktop.Platform.Implementation.Services.Log.Resources(Object message, Action action)
   at Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.ExecuteAction(IAction action, ActionOrigin origin, Boolean allowToggle)
   at Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.ExecuteActionForShortcut(Keys shortcut)
   at Sdl.Desktop.Platform.WinForms.StudioWindowForm.OnKeyDown(KeyEventArgs e)
   at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
   at System.Windows.Forms.Form.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyPreview(Message& m)
   at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
   at System.Windows.Forms.Control.WmKeyChar(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>14.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>14.0.5821.4</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1253</CodePage>
    <LoggedOnUser>PC\spiros</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>PC</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>16725736 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>