Rolan Yang, David Krings, and Paul Jones all suggested that the problem might be caused by users who weren't accepting cookies (and for whom the session id therefore needed to be passed as a $_GET variable); they were right. As soon as I fixed the redirect to include that, the problems went away. Thanks, guys, and everybody else who responded.

Michael Southwell, Vice President for Education
New York PHP
http://www.nyphp.com/training - In-depth PHP Training Courses


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