Hi Hubert,

I've done a little digging and it seems this is a long-standing bug that we thought had been fixed... but whose resolution I now rather suspect was obfuscated by some other issues that appeared in trying to address it. So our apologies for that. I have reopened the original issue on GitHub.

I've also done a little testing and I'm sorry to say that I cannot see an easy workaround for you. The best I can offer is to point out that you can save the computed theory curves to file by either right-clicking on the plot or on the theory dataset in the Data Explorer, and you can save the model parameters in the FitPage to file using Edit > Copy params to format... or Edit > Save params to file, but there is no facility to reload them into a FitPage, it would be record-keeping only. This also has to be done FitPage by FitPage.

Kind regards,

Steve King