Even though you kept the account name and PC name the same it is a new build and I believe Windows 10 UAC will still see it as a different user with different permissions. Here's a link
for enabling / disabling Windows 10 UAC. I'd try my suggestion first about building a new folder on your new PC and drag a few videos into it. if that works I'd try disabling UAC. This isn't likely a database issue if you are seeing them in the GUI in a folder view (not a playlist view). This sounds more like a permissions issue with the Mezzmo service being able to access the files on the NAS for playback.
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