Not sure if this is a known issue, but I was unable to find anything in the documentation or on this forum. I am using a PBRMaterial, adding an HDR reflection texture, and then adjusting the roughness value. On my ipad Air 2 roughness has no effect. Desktop and Android devices that I have tried work fine. The same issue appears if you use textures rather than setting the roughness value.
I am hoping it is something simple that I have overlooked. Thanks for the help.