HSFX 6.0.17 and torpedo

When I use my HSFX 6.0.17 version I can’t see the torpedo’s wake. In a game with other pilots they can see it but I can’t.
With the same intallation if I use 4.11.1 version the torpedo’s wake are perfecly seen.
Any idea?

PS this on Windows Xp SP3

Update. Same issue I have in Win 7