You are SUPPOSED to miss the phone call from the professor and learn that from Gerde. It's okay, you can call him back.
If you're not getting that cut scene, then you missed something at the museums. Be sure to look at everything, including the display case below the painting that reminded Grace of her dream, and listen to the tape for everything at the castle. Also, after you've looked at the wolf panels in the castle, go back and ask Georg about them.
You can also go back and ask Huber and the Smiths about things as you learn new stuff.
Post edited January 11, 2017 by cbingham