Mac, If you haven't done this yet.
You can also define your own level of transparency by making a copy of
a glass material in: Options>Element Attributes>Materials, and set your own level of transparency, and by the way, a color tint you like for your glass while your at it.
And you should set up your "profile" while your at it. It's a nice touch, and usually means you will get faster response to complicated questions.
Bier