After the latest Android update, all my old contact (door/window) devices now read off line. Has anyone else experienced this? Thanks.
Highly doubtful that the app update did this, imo.
V2 and V3 hubs were updated in the last 48 hours or so.
Does the IDE show them offline as well? Have you tried a reboot of your hub?
Brand and models as well as your country are always useful.
After 48 hours of tinkering with the contact sensors with success I have to conclude it would be the hub. These are the older (original) contact sensors so it would seem they have been involuntarily retired.