Live logging not working _

I’m trying to produce output from my SmartApp to Live Logging in the IDE. I can’t get any log output to appear, even though I have verified the method containing the log calls is being executed. I’ve tried various things like: "hello world""hello world")
log.debug "hello world"
log.debug("hello world")
log.error "hello world"
log.error("hello world")

Is there a setting elsewhere which is suppressing or disabling my log output? Some IDE setting or App setting? Is it simply utterly broken? What am I doing wrong?