When Logos 6 is running and I switch to another user account (Windows 10) I find that instance is using significant CPU (28% +) without any event having started prior to switching i.e. no indexing, no downloading because it is not set to Auto Download. Logos does not have to be running in the new account.
If you find my original report it should indicate whether this is since Windows 10 or since Logos 64 bit, as this problem did not exist previously.