Calling Transform() With No Srid Set Is Not Supported

On production server I receive the attached error, not emerging on the development server. Both environments are identical (same Django 1.6 and Python 2.7 versions, using virtualen

Solution 1:

I was able to solve my issue by uninstalling and then re-installing all the libraries (as ubuntu packages), the python interpreter, all the code, by re-generating the database (including reinstalling postgis) and then by completely restart nginx (and thus gunicorn). No libraries were updated, however, so I still do not understand what really happened.