Hi Christophe,
I will check URBI forum too and also deeper look at our code to see if we can figure out when does this happen.
The problem is when we start URBI server in the shell, it will be closed as soon as it crashes, so I won't be able to send you backtraces, otherwise there is a log file for the same output which I don't know about that. Please tell me if there is.
Thanks,
Mohammad