Blank screen when updating user roles in groups

Using Firefox 10.0.2 for Mac OS X I get a PHP blank screen of death whenever I update a user role on a group, as for instance at a page such as https://www.zotero.org/groups/64523/settings/members/ (it has happened on other group "members settings" pages too). When I back out of the screen, however, the user's role does appear to have updated.

It happens in Chrome, too.
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