Well in that case the second part of my description is probably the applicable problem. If you click on something in the binder and go straight to that menu, the active area isn’t a PDF viewer, it is the binder. You have to click into the editor (or press ⌃Tab) first. It's a picky thing, but software can be extremely literal.
.:. Ioa Petra'ka “Whole sight, or all the rest is desolation.” —John Fowles