Can confirm that http://10.10.10.225/graphs/ only gives one line with:
Traffic and system resource graphing
Send an email to support@mikrotik.com and report the problem.
You can use SNMP or Syslog to get CPU to an external server.
Here is a graph from Splunk for MikroTik, se link in my signature. http://forum.mikrotik.com/t/tool-using-splunk-to-analyse-mikrotik-logs-4-0-graphing-everything/153043/1
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