It doesn't seem entirely resolved DanG - I'm still unable to login inside Publisher (reinstalling after an OS upgrade) I can login to my account just fine at https://affinity.serif.com (which is where I downloaded the application from my purchase history) but entering the same credentials inside Publisher keeps coming up as invalid - they're exactly the same, I've even reset the password to see if that shook it free but no joy, and the language is set to UK English as advised above. My registered email is a .scot address which the app wants to autocorrect to .se could this be part of the problem?