Using the following xaml:

<TextBlock x:Name="MyReadout_TextBlock">
  <TextBlock.Text>
    <Binding Path="SmallChange" ElementName="MySlider">
      <Binding.Converter>
        <noesis:MathConverter/>
      </Binding.Converter>
    </Binding>
  </TextBlock.Text>
</TextBlock>
<Slider x:Name="MySlider" SmallChange="{Binding Path=Text, ElementName=MyReadout_TextBlock}"/>

Changing MathConverter Expression causes Studio to enter infinite recursive loop.