Over on the webCoRE forum strange goings on have been reported, supported by a Facebook thread.
The bottom line seems to be that the setLevel command, and indeed the switchLevel capability, has gone AWOL on Lutron and cloud based Wi-Fi devices on both webCoRE and ActionTiles. It is however working fine on the mobile apps.
As ever support will not entertain the possibility that problems with third party apps could in anyway be indicative of a possible problem with ST.
I don’t use webCoRE any more, and I don’t have any problem devices, but it looks to me like something has gone tits up somewhere.
Anyone got any extra ammo they could use, for example similar issues with Smart Lighting?
Lutron devices aren’t WiFi: they use their own proprietary frequency and then a cloud to cloud integration to ST.
So if it were just Lutron, I’d suspect that integration rather than WiFi dimmers.
But from the thread you linked to, it sounds like other cloud to cloud integrations are involved as well, including Leviton’s WiFi model. However, it looks like direct-connected WiFi devices like Sonoff are NOT having the issue.
So I suspect something in the cloud to cloud API, not a particular protocol.
Tagging @joshua_lyon in case he’s seen anything over at SharpTools.