For some time now I have been noticing an error that appears in error log file if I use All In One Seo pack and Subscribe to comments reloaded plugin together. Following is the error:
WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') <= DATE_SUB(NOW(), INTERVAL 2 DAY) AND meta_value LIKE '%C'' at line 3 for query DELETE FROM wp_postmeta WHERE meta_key LIKE '\_stcr@\_%' AND STR_TO_DATE(meta_value) <= DATE_SUB(NOW(), INTERVAL 2 DAY) AND meta_value LIKE '%C' made by do_action_ref_array, call_user_func_array, wp_subscribe_reloaded->subscribe_reloaded_purge
This error did not appear when I removed this plugin.
Please take a look at this.