Hi Ilshad, zope.app.wsgi 3.9.0 has a bug fix related to logger. Please check whether that is related to the two "root" handler issue you are looking at. BTW, BB 1.0a5 use 3.6.1 release of z.a.wsgi . I am not sure why minor version numbers are bumbed for test case refactorings in last three releases. Regards, Baiju M