The tma right-click window allows you to select how old the oldest line is allowed to be before it's removed from the display.
If the yellow lines disappeared, it may be because they were older than the limit set here.
You can indeed fire a torpedo on a Vn contact. If it didn't work, there was another reason to it. First of all, if your air charge is too low (fired too many weapons already, emergency blow) you can't fire anyway. Secondly, unless you press "enter solution" in the tma screen, the solution isn't "fire control ready".
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