While working on my Mass Effect Ammo mod I've noticed that when I shoot Deputy Weld with cryo ammo the game CTD. However other Protectrons, Mister Gutsy, and sentry bots freeze and paralyze just fine. So I tested the cryo ammo without the paralyze effect and it works fine when I shoot Dep. Weld. So I'm guessing the problem has to do with Deputy Weld's model or animation in that he can't "fall over" correctly.

I'm just throwing this out here and curious if anyone knows how to fix the problem.

If it is just Weld, I recommend excluding him from the effect by some manner of script or "immunity".
He respawns after being killed as well.

Weld is not just your average protectron. He has some specialized scripts.

This CTD reminds me of a prob someone repoted on one set of colussus armor when the player gets hit by the flamer. The SMS effect I believe.