Same issue here... I've copied my full .twinkle folder from Ubuntu12.04 to a new machine using 14.04 and have no GUI when running it, but Twinkle registers in the SIP server (I've changed the user's extension in .cfg file and I can here the ring tone when calling the new one).
-- Daniel Mustieles García Dpto. Servicios Informáticos Universidad a Distancia de Madrid (UDIMA) Tlfn. 902 02 00 03
