Interesting. I received a notice several weeks ago, announcing that the
site would be unavailable to me for 3 days, while they migrated my
records to a new system.

Sure enough, at the end of that 3-day period, I re-registered and
everything's working like a charm.  In fact, it's working for me BETTER
than before: Because I had had Retention fix a problem with my account a
couple of weeks ago (giving me the unlimited SMS that my account was
supposed to have, instead of 500/month), I was (as usual) locked out of
"current usage" stats until the end of the billing period, which is in a
few days.  On this new system, I'm no longer locked out, and can see all
my current usage stats.

That's one annoyance out of the way!

Oh my god, late this afternoon it worked.
ok I have to give one point to sprint CS.
and I made my payment.