django 1.4.3 to 1.4.4 upgrade fails - Bad magic number Import Error

Hi,
we are using jenkins to build our django stack,
we changed the django version from 1.4.3 to 1.4.4.
this results in a

ImportError: Bad magic number in /x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/contrib/sessions/management/__init__.pyc

Even deleting all pyc files does not solve the problem.
We are using python 2.5 on solaris.

Any suggestion would help, digging the net has not shown fix, beside delete pyc files.

The same problem appears on another project updating from 1.3.5 to 1.3.6

Thanks
Frank

Traceback below


Creating test database for alias 'default'...
Traceback (most recent call last):
File "/x86build/dpp/opt/django-auth/authhub/manage.py", line 24, in <module>
execute_manager(settings)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/__init__.py", line 459, in execute_manager
utility.execute()
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/__init__.py", line 382, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/base.py", line 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/base.py", line 232, in execute
output = self.handle(*args, **options)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django_jenkins/management/commands/__init__.py", line 81, in handle
if test_runner.run_tests(test_labels):
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/test/simple.py", line 381, in run_tests
old_config = self.setup_databases()
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django_jenkins/runner.py", line 260, in setup_databases
return super(CITestSuiteRunner, self).setup_databases()
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/test/simple.py", line 317, in setup_databases
self.verbosity, autoclobber=not self.interactive)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/db/backends/creation.py", line 271, in create_test_db
load_initial_data=False)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/__init__.py", line 150, in call_command
return klass.execute(*args, **defaults)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/base.py", line 232, in execute
output = self.handle(*args, **options)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/base.py", line 371, in handle
return self.handle_noargs(**options)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/core/management/commands/syncdb.py", line 40, in handle_noargs
import_module('.management', app_name)
File "/x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/utils/importlib.py", line 35, in import_module
__import__(name)
ImportError: Bad magic number in /x86build/dpp/opt/django-auth-venv/lib/python2.5/site-packages/django/contrib/sessions/management/__init__.pyc

Fatal error: local() encountered an error (return code 1) while executing '. /x86build/dpp/opt/django-auth-venv/bin/activate && python /x86build/dpp/opt/django-auth/authhub/manage.py jenkins'



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