Please note that importing Projects from Cubasis (iOS) into Cubase 7.0.3 leads to missing audio files and stability issues. We are currently researching the issue and will provide a solution as fast as possible which will then be rolled out in an Importer or Cubase maintenance update.
In the meantime the only workaround is to import Cubasis projects into Cubase 6.5.x or Cubase 7.0.2. Apologies for any inconvenience this may cause.
EDIT: This problem has been solved with the Cubase 7.0.4 maintenance update.