symfony sf_user attributes disappearing

[blurmy24]

I've inherited a small symfony project that's causing a big headache. On the live site, I enter the following into preExecute in apps/frontend/modules/top/actions/actions.class.php:

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$this->getUser()->setAttribute('foo', 1);

I then load the page. Then I replace that line with the following:

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error_log($this->getUser()->getAttribute('foo', 0));

I reload the page and, as expected, I see a 1 in the error log. On our dev site, however, the same actions spit a 0 into the error log. $_SESSION vars seem to disappear as well. I'm not a symfony expert and I have no idea how to track this down. Suggestions?