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PS - Is there any documentation that describes the minimum permissions a cron job only user needs? (this is the one cron that rules them all, calling all scheduled jobs). I'm a bit twitchy about the security of putting this username and password into a plain text cron file on the server available for anyone who hacks in.
did you upgrade Joomla to 2.5.18 at the same time?there are some changes in the authentication method in 2.5.18 and I think that's what is causing the problem. I'm researching.
please try this patch:https://github.com/civicrm/civicrm-core/pull/2512