Yùn Ciao shell connector buggy?

Hi everybody.
The provided Library sample sketch for the shell connector (date) does not work correctly for me.
It calls the "date" shell command every 10 seconds and prints the current date on the serial monitor.
BUT in my case it prints the date correctly every 20 seconds because the connector's write fails alternatively returning "no_result".
Can anyone simply run the sample sketch and check if gets the same result? It's an easy test, just see if the date seconds increase by 20 seconds instead of 10, as supposed to do.
I tried many variations, but the result is always the same: Ciao.write("shell","date") returns current date, but next time returns "no_result", then next time ok, then "no_result", and so on.
I cannot find any feedbacks about this issue, as if the Ciao library, in particular the shell connector, is not used by anyone or not supported any more...