Colour threshold slider doesn't update value when switching groups

Open an alignment and create two groups. Set Colour by Conservation, with different increment values, on the background alignment and each of the two groups. Leave the increment slider open.
As you click on the groups or the background, the title of the slider panel changes to the group or 'background', but the slider value doesn't change (to the current setting for the corresponding region).
Similar problem if the slider panel is open on 'New View' or change view tab: the slider is still linked to the view it was opened for; changes in the slider affect the 'wrong' view (not the one displayed).