After GMLive has run for a while (sometimes just a couple of seconds), the runner exits with non-zero status seemingly at random. This happens on 2 machines that I've tested.
Simply enable live call in any object's draw GUI event, then leave it as is and wait.. (The object has to be active and running within that scene)
After a bit, it'll crash/exit with non-zero status.
There's also no error log to assist with the troubleshooting too. This is all the message that I get.