I waited a while, and tried again, with no luck. Finally after several tries I checked the SL Blog, and found the following:
Login Difficulties
[5:15PM Pacific] We’re currently experiencing an issue with logins. You may see a message that indicates you cannot log in due to the system clock being set incorrectly. As a temporary workaround, setting your computer clock to Pacific Standard Time should allow you to login.We’re working on resolving this issue as quickly as possible and will post here with updates.

I waited a few minutes for the cloud to fade. It soon did, but I got a bit of a shock. It seems SL had lost most of my fox avatar, leaving me a shape I hadn't seen for a long while. I'd been "ruthed" for the first time in well over a year, the look so familiar to long-time residents.
Others at the party had lost items too, such as jewelry. Someone suggested that I clear cache and relog. I did so, and coming back, was able to become a foxy guy again, much to my relief (and the others around me and in IM).
Leaving the place after the party, I got my sound and voice back. Though as so often these days, things still could take a while to load due to the lag.
The metaverse thrown out of wack because of a clock? Something seems a bit "cuckoo."
Bixyl Shuftan