Win7 x64 Enterprise, Process Explorer v16.20.
On a process' Security tab, only a few privileges are listed instead of three dozen as it should:
I doesn't matter if I run Process Explorer elevated or not.
According to What is the State column returned by whoami /priv?, a privilege is only present in the list if it can be acquired at all.
Kind of a Polichinelle secret: not only can't I acquire a privilege, I can't even find out that it exists :)