GMB was OK during several months , but after a normal update of Kubuntu ,  the starting fails.  Only the icon appears then it disappears after few seconds. 
I tried to desinstall then reinstall, but still KO.
Can  somebody help ?
 
Kubuntu, 14.04 / 64

Sorry for not replying sooner.
If it's still a problem, can you launch it from a terminal and look at what is printed ?