Adding second group breaks OG Forums

Well, they still sort of work, but I get the error below from mysql. I didn't include all of the text but this occurs on all attempts to access the forums. All modules appear to be up-to-date. Things are fine with the first group, but the next group created causes the problem. When I delete the second group, the first starts to work again. Any ideas how I can get around this?
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user warning: Lost connection to MySQL server during query query: SELECT ncs.last_comment_timestamp, IF (ncs.last_comment_uid != 0, u2.name, ncs.last_comment_name) AS last_comment_name, ncs.last_comment_uid FROM node n INNER JOIN users u1 ON n.uid = u1.uid INNER JOIN term_node tn ON n.vid = tn.vid INNER JOIN node_comment_statistics ncs ON n.nid = ncs.nid INNER JOIN users u2 ON ncs.last_comment_uid=u2.uid WHERE n.status = 1 AND tn.tid = 22 ORDER BY ncs.last_comment_timestamp DESC LIMIT 0, 1 in /var/apache2/2.2/htdocs/modules/forum/forum.module on line 528.
user warning: MySQL server has gone away query: SELECT * FROM term_data WHERE tid = 21 in /var/apache2/2.2/htdocs/modules/taxonomy/taxonomy.module on line 1012.
user warning: MySQL server has gone away query: SELECT * FROM system WHERE type = 'theme' in /var/apache2/2.2/htdocs/includes/theme.inc on line 449.
user warning: MySQL server has gone away query: SELECT data, created, headers, expire, serialized FROM cache WHERE cid = 'theme_registry:' in /var/apache2/2.2/htdocs/includes/cache.inc on line 26.
user warning: MySQL server has gone away query: SHOW TABLES LIKE 'date_format_types' in /var/apache2/2.2/htdocs/includes/database.mysqli.inc on line 344.