Pretty sure the FTB launcher doesn't work. Like, at all.
I use a mojang account rather than just Minecraft and can't login despite my details being correct. (Even when it doesn't IOException because they're not gracefully handling HTTP errors)
Also, an exception before showed in the log that it sends the password in the clear, not as a hash (I'm pretty sure it's meant to transmit as a hash) - and after the update, this exception isn't logged at all so if there's problems they can't be debugged.
Poll