You may want to periodically view the Control Center error log to troubleshoot issues. All errors that are related to the Control Center are written to the BrightmailLog.log file.
Each issue results in a number of lines in the error log. For example, the following lines are the result of Spam Quarantine receiving a message that is too large to handle:
com.mysql.jdbc.PacketTooBigException: Packet for query is too large (3595207 > 1048576) at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:1554) at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:1540) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1005) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1109) at com.mysql.jdbc.Connection.execSQL(Connection.java:2030) at com.mysql.jdbc.PreparedStatement.executeUpdate (PreparedStatement.java:1750) at com.mysql.jdbc.PreparedStatement.executeUpdate (PreparedStatement.java:1596) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate (DelegatingPreparedStatement.java:207) at com.brightmail.dl.jdbc.impl.DatabaseSQLManager.handleUpdate (Unknown Source) at com.brightmail.dl.jdbc.impl.DatabaseSQLManager.handleUpdate (Unknown Source) at com.brightmail.dl.jdbc.impl.DatabaseSQLTransaction.create (Unknown Source) at com.brightmail.bl.bo.impl.SpamManager.create (Unknown Source) at com.brightmail.service.smtp.impl.SmtpConsumer.run (Unknown Source)
See About logs.