I opened a case to ask about it yesterday. This morning, they said, "due to issues with legibility the option to switch to and from dark mode has been disabled." Following that they said to delete cookies.But this morning it looks to have reverted to...

Yeah, but it looks so weird, and I can't find a way to turn it off. Usually I'm a dark mode junkie, but it looks like that "high contrast" windows mode and then I can't find anything. Anyone found a way to turn it off?

I had the same problem, thanks for telling me what to check. I overlooked the SSID-specific firewall rules. I allowed outbound traffic when it was set to deny for Any->Local LAN for that specific SSID and it fixed it. Can't say it's default, but for ...