Intel GMA 950 and Overture

[jacktheripper]

Helloes,
I tried Overture recently, got the apparently famous black-screen-after-intro problem on my Intel GMA 950. I read on a forum specific for that card that Black Plague works perfectly. Since it's obviously a graphics problem (engine problem), both games use the same engine (is the copy on git latest ?) and Black Plague is newer, I thought that the engine on the disc is outdated.
I grabbed a git copy of both the engine and the game, compiled successfully and it still didn't run.
I don't get the logic here, can anyone explain why would the newer game run instead ?