Glass refraction issue : some objects look black when i see it through glass.

[user_36c766cad03c0a05b5471ed6a6fda6b73c869914877f366ebca33d (느긋맨)]

Hi, the Glass and the mountain look black when it seen through glass.
i tried set Translucency to Raster or RayTrace. not worked.
anybody know how to fix it?