I just finished level 1, lesson 7.7: Das Perfekt. I was corrected by the instructional program in two instances, both of which I believe were in error.
"On September 28, 1975 we celebrated together."
My translation: "Am achtundzwanzigsten September..."
Corrected translation by the program: "Am achtundzwanzigste September..."
This example appears in the Action Relay section, the Activity: Flashcards section and the Activity: Write It section. If this is, in fact, in error, then for the sake of future students taking the course, I kindly bring this to your attention.
"She graduated high school in 1999."
My translation: "...neunzehnhundert-neunundneunzig..."
Corrected translation by the program: "...neunzehnthundert-neunundneunzig..."
This appears in the Activity: Write It section (and perhaps elsewhere in the lesson, I don't recall). This, too, I believe requires a correction in the program.