This applies to MySQL 5.6.
phpMyAdmin removes the grant option by default if you modify user rights even if there is no grant option defined for that user, so Replication always breaks if you use phpMyAdmin to modify user rights for a certain table on which the user has no grant option.
Replication also breaks if you revoke the grant option from a database or table if the grant is not defined.
mysql> REVOKE GRANT OPTION ON
test_table FROM 'testuser'@'127.0.0.1';
ERROR 1141 (42000): There is no such grant defined for user 'testuser' on host '127.0.0.1'
Leads to a "Incident: LOST_EVENTS"-Entry in binary log and makes the slaves stop.
Applies to all phpMyAdmin-Versions i suppose. Tested in 22.214.171.124 and 4.0.5.
According MySQL-Bug: http://bugs.mysql.com/bug.php?id=68892
phpMyAdmin should only execute "revoke grant option" if the user has a grant option on that table.