Don't need to stress @GermanVet, the Department of Immigration does external integrity checks etc, which they won't tell the applicant. As long as all the documents are correct and genuine, it might take some time. Once you have been nominated by a state government and all the points add up correctly, then there should not problems. The holiday season also means it would take a bit longer than usual. You might write to them in February to follow up. There should be an email address towards to the bottom of the first page of the Acknowledgement Letter (in the footer).