Same issue here! I set some breakpoints with pdb, and strangely
enough, inside the app_enabled() function, "models" doesn't refer to
django.db.models but satchmo_utils.models!
Pdb reveals that "models" has the correct value at import time --
right after "from django.db import models" as well as at the very end
of the module. Only inside the function it points to the wrong module.
I posted a traceback at http://dpaste.com/hold/51617/