I know the level 2 mission don't have the right order at the moment but this 
bug is something else:

When escorting admiral Benson, OpenIG shows a garthog ships trying to reach the 
admiral in order to attack him. Sometimes the ship reaches the admiral, 
sometimes not.

Let's do it the DOS IG way and that problem never happens:

DOS IG NEVER shows the attacker in such cases. The admiral is on course and 
eventually he is being attacked...hopefully with your escort. The attack just 
happens. No enemy flying towards him. This has two advantages: 

1. No problem of an enemy arriving (or not arriving) in time.
2. It's a surprise for the player because he can not see this.

An example of the enemy being to late in OpenIG:

http://img171.imageshack.us/img171/4134/benson.jpg

Btw.: As you can see the benson mission got triggers although the infection was 
still in place. I know, I know, the missions are not final so that'll change :)