Previously erlang-gproc fails to pass the tests due to the issues in the erlang-gen_leader available in Fedora/EPEL. Recently gen_leader was updated and now all gproc tests from the latest gproc's release are passed. So we really must update it as soon as gen_leader hits EL6, F16 and F17 (already in Rawhide).
erlang-gproc-0.2.11-2.el6 has been submitted as an update for Fedora EPEL 6. https://admin.fedoraproject.org/updates/erlang-gproc-0.2.11-2.el6
Package erlang-gproc-0.2.11-2.el6: * should fix your issue, * was pushed to the Fedora EPEL 6 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=epel-testing erlang-gproc-0.2.11-2.el6' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-EPEL-2012-6277/erlang-gproc-0.2.11-2.el6 then log in and leave karma (feedback).
erlang-gproc-0.2.11-2.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.