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I am having the same issue -- I get the invalid Username / Password when I try using it at the URL level when I replace the 3 files with with the 3 in the answer above - I get returned a blank screen and when I check the back end the jobs have not been runJoomla! version, 3.2.3. Powered by CiviCRM 4.4.4.thoughts
@globeseek: try this patch --https://github.com/civicrm/civicrm-core/pull/2833I confirmed there were additional includes that needed to be referenced for Jooma 3.2.1+