On windows 7 Enterprise domain joined workstations we upgraded ZCM agents to 2017.1 (17.1.0.1347)
On every computer on which we do that after presssing Ctrl-Alt-Del to login we first get "other user" icon which must be clicked (or confirmed with Enter) before username and password fields for login appear.
I had test virtual machine wirh 2017 (wirhout update 1) client that worked fine (login fields immediately after ctrl-alt-del). After upgrading to 2017.1 it behaves in the same manner.

Has anybody any idea, avareness of bug or something .... ?