I played the beta and remember how the ship trails used to look and function, and I find that now that I'm playing the full game, the trails are completely missing, except from premade ships (Defender, Scout, etc.)
On a few of mu custom ships it seemed like I could maybe make out the very tip of a trail, as though the trail were moved too far inside the hull and therefore almost completely obscured.
I do not have the option disabled in the option, by the way, and my video card should be able to handle it (Radeon 9800 Pro) and if not I'd still like to see them and turn them off if necessary. I thought it might be a driver issue but the trails were missing on the same drivers I used in beta, and upgrading to the very newest ones didn't help.
I'm sure this is not a priority, but it was a cool effect so I figure I'd mention it. It would also be nice if "extras" with clearly "engine" parts to them also left trails, though I figure this might be too much work to implement (or too taxing on the machine). If not though, that would be amazing.