Why does WebClient not work after upgrade to 10.3

Document ID : KB000116723
Last Modified Date : 02/10/2018
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Introduction:
We upgraded to 10.3 yesterday. 
I can navigate in the web client and restful works, but I have no data in the web client. 
No alarms and no devices in the topology. 
OneClick Works. 
this has worked before the upgrade. 
I am using an admin user, that works in OneClick and has all privileges. 
Question:
Why does WebClient not work after upgrade to 10.3?
Answer:
Please ensure that the security string of the user matches the containers.
Additional Information:
About Using Security Communities to Manage User Access to Models and Devices​:
https://docops.ca.com/ca-spectrum/10-3-0/en/administrating/oneclick-administration/user-administration-in-oneclick/about-using-security-communities-to-manage-user-access-to-models-and-devices/