I played that convoy attack over again tonight after getting the "1 fps" bug sorted out, and it played out even funnier!
Restarting it before my 1st shot, the convoy was steaming along at aroud 8-9 kts. I crippled a merchant in the 2nd row, broke her back but she wouldn't sink, and just like before, the entire convoy came to a screeching halt.
This time there was a Fubuki DD stopped dead astern of me at about 600 yds. Just sitting there, showing no interest in me or anything else. No pinging, no searchlights, no nothing! That bit gets interesting, a little later...
So I set up a shot on a Large Modern Composite Freighter in the 3rd row and sent her to the bottom with a single torp.
After that 2nd attack, the DD suddenly woke up! Started pinging crap out of me, searchlights came on and sweeping the ocean but on the wrong side. (I was between her and the convoy) But she still didn't move an inch.
Don't know what I'm talking about of course, but with the DD knowing the position of the 2 ships I hit, seems she should have been able to triangulate my position pretty accurately. But nope, she just sat there!
I can hear the DD skipper now, doing his best Elmer Fudd impersonation:
"Be vewwy vewwy qwiet!!! I'm hunting submaweens!!!"
Then that "wascally submaween" outdid Bugs Bunny even
I had a textbook shot from the stern tubes, target dead astern at 600 yds, about 85 port AOB, target speed 0, my speed 0, can't miss!
I fired a fish, perfect shot and no dud, big explosion and Mr <fu>DD suddenly woke up and went to flank speed! Instead of coming after me though, he high-tailed it west as fast as he could, to put max distance between me and him asap
If I hadn't paid good money for this sim, it would have been hilarious. Think something is seriously broken here...