After investigations, commit the proposed patch by kklimonda presented with the following introduction : cm/templates/site/login_form.html template uses a relative url for the form action, which seems to break deployment in the subfolder when trailing slash is missing (the form redirects to the upper folder breaking login). Using {% url login %} (as in the attached patch) instead would fix the issue.

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from django.conf.urls.defaults import *

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# Uncomment the next two lines to enable the admin:

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from django.contrib import admin

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admin.autodiscover()

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urlpatterns = patterns('',

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    (r'^admin/', include(admin.site.urls)),    

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    (r'', include('cm.urls')),

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)

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try :

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    import urls_local

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except ImportError :

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    pass