Glass turning other materials darker and transparent

When I render a surface between two pieces of clear material it is darkening my surface and also making it transparent. Any way to fix this?
Render Test.3dm (349.8 KB)

Hello- that is a reflection -

image

Am I seeing what you are asking about?
Also a very high IOR on the glass material makes things worse - glass is typically more in the 1.5- 1.75 range.

image

-Pascal