Ever since I installed the technical preview I have been having a strange problem with apps. All modern app data such as email account credentials, weather locations, and settings are wiped whenever I reboot my computer as if I freshly reinstalled each app. I am using a local user account rather than a Microsoft account if that makes any difference. I am yet to see another MDL member report this problem. If anyone has a quick fix please let me know, if not I will just live with it until the next build is released. Thanks
I didn't use any Store Apps but it reallyt could be that those Store apps need to run correctly with an MS Account. You could normally easy test that: just create an 'extra' MS Account and run that as admin, install such apps and configure and restart the computer to see your credentials are still valid.