More problems with Liberian Liberation mission

[Wolfhound]

I've played 688(i) and Sub Command before, but I just got Dangerous Waters and I was trying out the P3C Orion. There seems to be some really really serious problems with this mission though. I found a thread about this before but it only addressed the SLAMs not hitting their targets.

According to the tasking you're supposed to destroy the buildings away from the helopad. I do this but still get a "mission cannot be completed message" in addition to a "goal complete" message for killing them. This is a bit hard to make sense of. Other times, the SLAMs will look like they hit the target but not destroy them. Anyone have any clues?

One time I actually did manage to destroy those buildings without getting the "mission cannot be completed" message, but the SEAL craft just disappeared when it reached its destination and never respawned to leave.