Following a migration to SharePoint 2013, one user had the error whereby every time they loaded SharePoint they were confronted with the error “Error: User Settings Not Initialized”.
In order to fix the error, open the User Profile Service Application from Central Administration. Next, click on Manage User Profiles and search for the affected user. Choose Edit My Profile.
Scroll down to the bottom of the profile screen and select Always use my personal settings and select the appropriate locale. Next, tick Use language and regional settings. Click save and close.
The error should now have been resolved. You can go back into the user profile and reset the two options you just changed.