Missing Textures for the Mirror and Refraction Issues

[mmmmmmm]

Hello,

I recently bought the game from the Mac App Store, and while it overall is running fantastically given the age of my laptop, apart from lag, I've noticed two things missing from the game:
1. The refraction effect (the blurriness in windows when looking out at the ocean) appears to be completely absent, even when I turn it on the setting.
2. When looking into a mirror, the reflection texture is completely absent.

These may be minor issues, but I was wondering if this was done intentionally by Frictional Games on the Mac version to boost performance, or it's something on my end?