I can confirm that downgrading from 15.04.0+17.04.20170314-0ubuntu1 to 15.04.0+17.04.20170213-0ubuntu1 makes the Display Icon return.
I can confirm that downgrading from 15.04.0+ 17.04.20170314- 0ubuntu1 to 15.04.0+ 17.04.20170213- 0ubuntu1 makes the Display Icon return.