> I've looked at the debugging page in the control panel, but it doesn't
> tell me anything I recognize as useful.
Are you sure that your authentication uses session? Maybe it uses
cookies? Try to set variable in the session on one page and display this
on the other one. Then wait for 15-20 minutes and see what happens.
Another thing that may cause this is session-resolution-seconds setting
in your zope.conf - this affect session timeout value.
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