Origin Version (Select Help-->About Origin): 7.0552 (7 SR4) Operating System: Win XP SP2
I updated my Origin 7 from SR1 to SR4 the other day, and since then I have not been able to get fitted curves to be added to the original plot when using the Fitting Wizard. I have made sure the Output Results box on the Results page is set to Active Graph, but the curve is not added to the graph. The NLSF worksheet that normally contains the data for the fitted curve is not generated, either. The residuals graph is plotted and added to the graph fine.
I can work around this problem, either by using the Advanced Fitting Tool or by outputting the curve to a new graph while using the Fitting Wizard, so this is more of a nuisance than a major problem.
Sorry, I can reproduce it either now. It is a bug in SR4 of Origin 7. I think we may have no more update for Origin 7, so you can just use the work around.