In Network Definitions I defined a DNS hostname (multiple records) for:
au.pool.ntp.org
However in System Settings this record type won't show under "Use NTP Server"
*Sniffle*
Also, the first time i entered Network Definitions after restoring a 5.2 backup it all showed blank. Had to reload the page. (Just showed top menus and then nothing underneath where the definitions go). May be a one off?