I launch lithtech.exe through NOT integrated videocard, that is through GeForce GT 750M

I have black screens when I play through my integrated card (Intel HD Graphics 4600).

Now, we have to decide, how to make lithtech use always normal videocard.

I won't disable my integrated card because other programs might be using it.

But, what's interesting. My Nvidia Program doesn't allow me to set a rule for lithtech.exe to launch it always via normal videocard. But what's more interesting, after I have launched the game via my Geforce videocard (through RIGHT CLICK - launch with...), I now don't have problems with black screen even launching with my integrated card.

I might be mistaken whether I always launch the game with my normal card or not, but nevertheless, it's not a big deal now when I can launch the game manually with the Geforce card.

I can't recall how many different fixes in different ways I tried that never worked, even made it worse at times and had me reinstall the game in a different folder as a last resort.

Well now my mm9 lets me see clearly during night. Underwater too.

So I'll state the steps that worked for me, thanks to Roman.

right clicked lithtech.exe in mm9's folder
execute with graphic proc >
chose my nvidia card instead of the integrated one
--- it told me I can't do that, proposed me to open the nvidia configuration panel ---
which I did
there I added a new game with lithtech.exe for mm9
set the default graphic card to be used as the nvidia instead of the automatic choice (that used to pick the integrated one I take it, because it was the sole other option)

I'm sorry I can't explain it better for I'm a newbie at this, but I hope this might help some to settle underwater black screen issues.

Have fun