In V5 if you have a reference attribute in a form, and you click the new "Hide Label" check box on the Edit Layout Cell form then the Label is not hidden i.e. the check box doesn't do anything.
Also, in v4.95 if you just left the label of a reference cell empty then the title box at the top of a reference attribute would not display. In V5 the title box always displays (even if there is no label), so you always get the collapse, print, export icons etc showing.