
Originally Posted by
mc12345678
The login information is contained in the database, but the admin side is controlled by admin/includes/configure.php where the store is controlled by includes/configure.php. So in the case of comparing two versions of ZC to each other, at least the two 1.5.5 files should be compared with each other as well as either of those files to your 1.5.4 version. Seeing as the image above is related to the admin, the admin versions should be compared.
An additional location to check is the admin/includes/local directory for any files that provide an alternate DB_ arrangement. As shown above, it appears that the database referenced by your 1.5.5 store (store side/admin side) is referencing an empty database which would be expected for a newly installed store before changing reference to a different database or importing a database to the one referenced by 1.5.5.