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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