I am using the same vCenter (Windows Server Installation) version 5.1.0 build 1123961 and vCenter Orchestrator (Linux Appliance) version 5.1.1 build 2942.
vCenter Server:
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vCenter Orchestrator:
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Something might be different between our configurations or software installations / versions ...
Hmm... let me know if you got some help from vmware.
Note:
You can install a vCenter Server Appliance in VM or deploy it from template,
it uses an embedded database (postgre sql, I think).