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.contrib import admin

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from cm.models import *

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admin.site.register(Text)

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admin.site.register(Role)

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admin.site.register(UserProfile)

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admin.site.register(UserRole)

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admin.site.register(TextVersion)

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admin.site.register(Email)

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admin.site.register(Activity)

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admin.site.register(Notification)