Enemy cloaked unit effects don't show up. Therefore I cannot see the ripples that enemy cloaked units make, so I never know when they are around

I am running lubuntu 12.04

I am using 2 ATI radion 4770 HD's in crossfire mode. I am running the game with PlayOnLinux. I have tried putting the graphics both on low and high settings, and nothing changed, the effects still don't show up.

It's greatly affecting my gameplay, does anyone have an idea as to what's going on?