Threshold not working

[derekfountain]

Here's a curious one. I open CM3 and it's in Lab mode. Grabbing the lightness curve's threshold vertical from the right side of the L curve graphic makes the image brighter as if I'd grabbed the top right anchor of the curve. The threshold feature (where the image goes dark and highlights are shown as you move the vertical inwards) doesn't happen.

If I click the Lab radio button, which is actually already selected, some sort of screen refresh happens and then the threshold vertical works correctly.

[-default]

Yes, this is one that is mentioned in the known problems.  I'll be tackling it shortly.