If you have transferred a WordPress installation to a new server properly (see also here), and have adjusted all paths and declarations in the database, wp-config.php, etc.,
then, as a rule, everything should work smoothly — with one exception. You may encounter incorrect or missing displays of text widgets or other widgets that are stored in serialized form in the database. In this context, serialization means that these objects must not simply be modified by replacing strings directly in the database using a text editor, as this can otherwise cause problems during checksum validation. Instead, you should undo the database changes made for these individual elements in the text editor (text widgets are stored as a single value in the wp_options table) and then make the corresponding changes through the WordPress backend.
