Code below works fine for me with TeeChart Pro ActiveX 2013
TChart1.Aspect.View3D = False
TChart1.AddSeries scLine
TChart1.Axis.Left.Logarithmic = True
TChart1.Axis.Left.LogarithmicBase = 10
For i = 0 To 1000
TChart1.Series(0).Add i, "", clTeeColor
Next
Does it work fine for you? Which TeeChart version are you using?