Save as default stops working

I make the required changes to fonts etc and it saves to user settings xml etc, but then after i reopen dorico 6 some font settings were incorrect so i changed again but the user xml doesn’t update

You’ll need to provide a more detailed report of precisely what you did, what you expected to happen, and what actually happened, ideally with an example project that will allow us to reproduce the problem, for us to be able to investigate.