My code cannot be saved to ESP8266

What do you mean no reaction ? Does your board freeze and become unresponsive to any command?
did you try reset() and load() after your save() ?
The save() work perfectly on my 8266 4mb board. It's only the save-on-send that doesnt.
Do you realize that in your code you do not call send() ?
For external modules, like ws, the code need to be uploaded too, for setBootCode to work. Have a look on the log of WebIDE to see how he send the module code too when you use upload button.
Try flashing a previous version of espruino, like 1.91, 1.92 or 1.93, maybe it will help