First, is this a stock DW game? Patched to which version? (should be 1.04) Modded?
Do the lines show up in the waterfall AT ALL when the sonar autocrew is enabled? If it detects something (either your own noise, or 'something out there'), then you get contacts displayed on the navigation map. But the trace on the waterfall may be to faint to show for distant or quiet contacts. You better make sure you have a noisy contact near if you want to test this. A Kilo generally isn't, even at 8 knots. Try tracking a surface civilian craft in some mission. Contact madness in New Zeeland comes to mind (Seawolve). Even in default settings I can get lines right at the start. Definitely in broadband. Also with VLAD SOF Pickup (688i). Verify that there really is something with Show Truth on.
The autocrew doesn't care about gamma settings, so you may just not have found the right setting if they don't show. In dangerouswaters.ini there is a line under the [Graphics] section:
.Gamma "decimal.number"
You certainly should see your own noise come out of the baffles if you have the towed array selected and make a large turn. Though it might take a few minutes depending on your speed. Of course, do not forget that the towed array needs to be streamed.
Other than that, I don't know. Maybe show us a screenshot of the situation and sonar screens.
P.S. Sonar suite primer:
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