matrix and vector math questions

[nckomodo]

cWorld3D *pWorld = mpInit->mpGame->GetScene()->GetWorld3D();
cParticleSystem3D *pSystem = pWorld->GetParticleSystem("SteamGunEffect");
cCamera3D *pCam = mpInit->mpPlayer->GetCamera();
pSystem->SetMatrix(cMath::MatrixRotate(
cVector3f(pCam->GetPitch(),(pCam->GetYaw()+1.57079633f),pCam->GetRoll()),
eEulerRotationOrder_ZYX));
pSystem->SetPosition(mpEntity->GetWorldPosition());

I've finally got it pointing the right way, almost, if I turn around the pitch seems to invert itself so it points down when I look up.
Any ideas?

I see you.