Five attempts now and it keeps breaking at the same spot. There's nothing to click to destroy the second set of incubators after having killed all of the Elachi in the room and its adjoining corridors.
Like the OP I was unable to get through the 2nd door. Waypointed area has no console to shut off the canisters/chambers. I jumped and wall-hugged the whole room trying to find if it was in a wall or in the floor, no luck. Going to restart mission in a few minutes and see if I can get any farther.
so is the defence of New Romulus, it just won't complete. (as in I can't hand in the mission.)
I have the same issue with this mission. I completed the mission to the end and have reentered sector space and can not turn the mission in to the contact. I noticed in the mission journal, that there is a check mark within the "Hail New Romulus Box", but it is grayed out and I can not click it to turn it in there either.