Hopefully it’s not just for me, but the excellent Achievements plugin is throwing this error
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, '' was given in /home/.unger/wonderchicken/jobsee.kr/community/wp-includes/plugin.php on line 414
for me, but only when I hit the summary page, and it only seems to happen when getting there from the Notifications part of the admin bar. If I go there from the My Account—>Achievements–>Summary, no error is thrown.
BP1.1, WPMU 2.8.4, Achievements 1.1, fresh install.