Please see screenshots:
http://i.imgur.com/Kvvdt.jpg
http://i.imgur.com/hTTAt.jpg
http://i.imgur.com/EUbuj.jpg

It becomes an issue in Lockdown, because everyone's stuck at the elevator part and cannot move. In some missions, particles don't display properly, and example of that would be the snarbolax mission. I tried troubleshooting but that doesn't work either, any suggestions? This only happens on my desktop, on my laptop it works fine. Sorry if this issue has already been posted.

Cheers