When importing address information and using the Address field to import address lines, the address lines do not import. They are blank although there are no exceptions and other address fields, such as city and state, import correctly.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.
Alternative Solution: Use the fields Address Line 1, Address Line 2, and Address Line 3 to import address lines instead of using the Address field.