Thanks for the quick replies! It can't be that I didn't pay my bill ... because I can't even get to the Login page. It can't be my equipment or my ISP ... because I can access all my usual sites, including success in logging into my other providers' accounts.
Meanwhile, all my Voip.ms DIDs are working just fine for incoming and outgoing calls.
I'll do what I usually do ... sit back, throw another log on the fire (in Boca Raton, no less), break out the wine and cheese, read a good book, take a short nap ... and try again later.