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.

import random
import unittest

from cm.converters import convert_from_mimetype

class TestConvert(unittest.TestCase):

    def test_oo_convert(self):
        res, attachs = convert_from_mimetype('cm/converters/tests/data/ooserver_can_convert_me01.doc', 'application/vnd.oasis.opendocument.text', 'markdown')
        print res
        

if __name__ == '__main__':
    unittest.main()