<https://forums.cpanel.net/threads/old-master-slave-dns-edit-bug-question.57270/>
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"I know that the old cPanel master/slave DNS configuration has been replaced by clustering, but I have just assumed control of a set of cPanel servers which are still using the old master slave.\r\n\r\nQuestion:  Any of you cPanel veterans familiar with a bug that would explain the following behavior?    It seems that if a user not hosted locally to the master server (in other words on another server which talks back to the DNS master) edits a DNS zone, such as for an MX edit, the zone file on the master becomes corrupt.    The edits are made on the master DNS nameserver but its as if all linefeeds have been stripped from the file in the process.  \r\n\r\nObviously a migration to clustering will ultimately be made to this set of servers, but just in case anyone is familiar with this problem, I'm curious if there is a quick fix.  \r\n\r\nSigned,\r\nLiving in yesterday :D"
<https://forums.cpanel.net/threads/old-master-slave-dns-edit-bug-question.57270/#post-269265>