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 On behalf of the SasView Collaboration SasView is a not-for-profit open source scientific software collaboration. Why not get involved? More details at https://www.sasview.org/contribute/. ________________________________ From: users <users-bounces@lists.sasview.org> on behalf of Hubert King via users <users@lists.sasview.org> Sent: 23 December 2024 15:35 To: users@sasview.org <users@sasview.org> Subject: [SasView Users] how to save theory for multiple trials? I'd like to use sasview to test several sets for a given theory (core-shell) I can't seem to save each trial as a project When i save project and reopen, the model type and parameters have vanished There are no data, just calculations Hubert King