[douglas]

A much more serious problem is that the Sithrak Portal in campaign 3 is not invulnerable before you get the mission to destroy it, you are guaranteed to get close to it before that mission, and that is a campaign-critical mission. I destroyed it right after scanning it the first time, and had to do some fiddling with copying the right map file from a very old savegame to avoid having to repeat a large portion of the campaign.