said by DaveSin:
Could it be a browser issue why it isn't showing up? Have you tried another Browser?
It's not a browser issue. In the section of the vPanel where the text form used to appear (for sending an outbound SMS), it now says "You do not currently have any SMS Enabled phone numbers at this time.
I didn't disable my phone # for SMS (not even sure there's an option for that), and the fact that incoming SMS continues to work would imply that my # is in fact "SMS Enabled."