the countdown is based on the OSC messages sent by the CCG server. So it's most probably that they are not getting thru to your client.
Make sure the corresponding port is not blocked by the firewall. The port is set in the casparcg.config. Its UDP.
Also, the client needs to start a OSC server in order to get the infos. Usually it should do that out of the box and as you connect to the ccg server, all should be running. But you can also set it up yourself.
Add a new OSC listener in the servers config with the IP of you client and use a different port, then config your client to listen to OSC messages on this port.
I'm not familiar with the exact settings in the client, but it should not be too hard.
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