Logged in users seeing other users profiles

I have inherited a 1.3 app that has users who belong to organisations. I have had reports from a few organisations who say that when more than one user from an organisation is logged in they all see the same user account (a logged in user from the same organisation). Local and test instances don't behave like this, and the code pulls up a user record based on $this->Auth->user('id'), so it sounds as if the session is not functioning correctly. Anyone experienced this or can give pointers about where to start looking for the issue?

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