Hello, I have the next problem , after upgrade before 2.1.18 and now 2.1.19 I have problems , all ip for clients were disappeared.like in the picture below , and only solution it was to uninstall and reinstall all clients , the version 2.1.18 it was ok but 2.1.19 I think it has problems . If you have a solution for this problem please type on this topic.