After upgrade to version 6.0rc7 syncroniced the ntp client no more
After downgrade to version 6.Orc5 was it good
This message to help
Greatings
Have the same problem! Does not work on rc6 and rc7, but only on cloudcore router! But no such problem on the RB450G . WTF?
check if ip address of NTP server is still responding to your requests. We have no issues syncing with server either using NTP (axtra npk) or SNTP(built in RouterOS system package)
still having this problem on rc9 
please help!
i have rb 2011, rb 750, this problem is solved with routeros rc9
I think that this proces need more time for syncronised.
Great to hear it works in RC9, plisken.
Masyanich, are you using the NTP server package? I checked, and NTP works on our CCR devices. Send a supout.rif file to support, we will check your configuration.