Question mark on function signature combobox

Hi,
  I have installed the latest stable version of SD : 4.3.1.9430. In this version I see a wrong function signature: there is a question mark instead of the type of the variable. For example:

Print (ref ? message)

instead of

Print (ref string message)

I have uploaded an image to www.stefanofraccaro.org/sd.png

Best regards