1) What happened
The Animator window becomes empty after "Configure..." in Rig

2) How can we reproduce it using the example you attached

1 Open attached project (the animator window should be already opened with "New Animator Controller")
2 Select in Project view Assets->MaleCharacterPack->vincent.fbx and in Inspector press "Configure..."
3 Press Play
Actual result:The Animator window becomes empty(but should not)

4 Open "New Animator Controller" (the animator window should be visible)
5 Make animation window not visible (make visible some another tab)
6 Select in Project view Assets->MaleCharacterPack->vincent.fbx and in Inspector press "Configure..."
7 Press Play and open Animator window tab
Actual result:The Animator window is opened with "New Animator Controller"

In both this situations the animator window should be opened with "New Animator Controller"

Please see attached video