HTH, I solved my case like this:
Windows 7 (64). Mspdebug had been running fine, but Energia just could never write to the board.
For a last attempt I unpacked another Launchpad box, which happened to be a v1.5 board -- and voila! :-o
(BTW: is it the *FET* driver appearing in Device Manager as a Generic HID Device?)
Needless to say, it's mspdebug now that can no longer recognize the board...
I saw the libusb driver not appearing either, so I tried reinstalling it with its "inf-wizard".
And, hurray, mspdebug works again! Cool.
But... Umm... guess what... Energia is back ag