my remaining gizmo credit was cancelled last week (it expires after one year if you forget to add to it before then, so mark that in your calendars!), and since i bought new credit this week i've been unable to call out through the gvoice website using gizmo as callback #, which worked great until last week.
none of my own settings were changed. (i don't have DC installed since i don't use sms.)
looks to me like google is messing up the software (?)