HDRI Community

Hi, in Maya 2016 + RenderMan 20.1 I have simple plane and sphere. Both have "PxrLMGlass1" material. Renders are showing that objects are transparent glass using an RenderMan Enviromental Light.
When I delete that light and add sIBL enviroment using the sIBL GUI (it works but not for the first time) but after my sIBL group apears in my Outliner and I do a preview render I see nice enviroment but all my materials which were before glass are showing as some white basic material.
Have anyone please idea how to fix it?
Thanks, Teresa...