Hi there, The new flask-admin==1.4.1 released on 2016-06-13 breaks the Airflow release currently in Pypi (1.7.1.2). So I just released 1.7.1.3 by pinning flask-admin to 1.4.0.
The only difference between the two versions is flask-admin being pinned to 1.4.0 Here's the fix for master that runs with flask-admin==1.4.1: https://github.com/apache/incubator-airflow/pull/1588 Max
