Missing colors and components on Linux

Hello there folks and girls. I’m finishing my game and I’m trying to port it to Linux, everything is neato, 'cept for a few things:

  1. My landscape color (I didn’t use textures) are mostly -nearly totally- missing from the game, 'cept for that little green part, what could it be?

  1. My splinecomponent (I use it to create a river) is missing too! That one doesn’t even appear:

  1. My particle system flickers a lot! Like a strobe effect, I’m not sure what could it be either.

All these screens are taken directly from Linux. I know Linux only supports 3.2 mostly, and I’m sure the materials are 3.2 compatible.