All belittling of the OP aside he does have a valid bug. There have been times when I've switched from a drone to another drone, or from a lead to a drone and I've lost my tracers while firing. The problem lies in the alpha of the gun sight blocking the tracer trails when firing, when this bug happens I can shift my view left or right and I can see the trails but they disappear in the gun sight itself. The only way to fix the problem is to switch to the lead plane and then go Ctrl 1-3 to get back to the plane you were gunning in.