Hi Jeremy,
Please submit an application that replicates the problem for further review. We tested with the following code and were not able to replicate this problem:
NChart chart = nChartControl1.Charts[0];
chart.Axis(StandardAxis.PrimaryX).Visible = false;
NStepLineSeries stepline = new NStepLineSeries(); chart.Series.Add(stepline);
stepline.Values.Add(10); stepline.Values.Add(20); stepline.Values.Add(30); stepline.Values.Add(10); stepline.BorderStyle.Color = Color.Orange;
chart.Wall(ChartWallType.Back).VisibilityMode = WallVisibilityMode.Hidden;
nChartControl1.BackgroundStyle.FillStyle = new NColorFillStyle(Color.Black);
Best Regards,Nevron Support Team