Thanks for the reply. I do not think it is that though. First, I completed the mission without any problems, so unless the update in question was during something like 24 hours between I played it and the annoucement, it's not it.

Secondly, the annoucement on Steam forum specifically referred to ...

Hello,
I have just, by pure chance, encountered a negative review of C:MO and from it I learned that the Silent Service has been pulled from sales due to scenarios being broken by recent updates. Developer posts on Steam forums confirmed this, with some ideas about how it might or might not get ...