MySQL replication working, but data is out of date
due to:

MySQL :: MySQL 5.1 Reference Manual :: 16.1.3.3 Replication Slave Options and Variables

Warning

To specify multiple databases you must use multiple instances of this option. Because database names can contain commas, if you supply a comma separated list then the list will be treated as the name of a single database.


my.cnf's incorrect syntax:

--replicate-do-db=DB1,DB2,DB3,DB4

was replaced with correct syntax:

--replicate-do-db=DB1
--replicate-do-db=DB2
--replicate-do-db=DB3
--replicate-do-db=DB4