[Chris]

FYI: On group home pages, the External RSS Feeds for Groups plugin (a.k.a., external-group-blogs) throws a fatal error during page load of group home pages, causing the admin bar to disappear:

PHP Fatal error: Cannot redeclare _bp_groupblogs_refetch() (previously declared in /var/www/wp-content/plugins/external-group-blogs/bp-groups-externalblogs.php:189) in /var/www/wp-content/plugins/external-group-blogs/bp-groups-externalblogs.php on line 188

Disabling External RSS Feeds for Groups from the a la carte section fixes the problem. While searching around, I realized that nearly every BuddyPress install I stumbled across exhibited this problem:

http://commons.gc.cuny.edu/groups/cac-community-team-project-planning/
http://www.vehiclefriends.com/groups/motorbikes/
http://usnaf.org/groups/sepa/
http://findbook.mta.rootgaming.net/groups/classic-jap-car-lovers/

This issue has been logged in the WP support forum but has not been acknowledged:
http://wordpress.org/support/topic/causes-wp-admin-bar-to-disappear

What’s strange is we didn’t uniformly encounter this error until very recently. It’s possible that our particular swirl of plugins could have masked it up until now: I recently disabled two plugins for testing purposes: Ajax Edit Comments and BuddyPress moderation.

[Author]

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