Glass material not transparent in cycles After following Andrew Prices' tutorial for coffee and a doughnut to the coffee part, I find that my cup seems to be frosted glass in the render while looking transparent in non-rendered views.

Is this caused by reflections in the environment, or have I got the material wrong somehow?  Any help would be appreciated.
Get glass material from: http://blendermada.com/materials/?engine=cyc&amp;category=glass&amp;keyword= Is it Cycles or Eevee? Refractions and reflections in Eevee are not so great. Use Cycles if is a still photo.