I found it. Setting Velocity only on the emitter is not enough. Velocity Over Time MUST be set to something other than 0 (which is the default). Would be a good idea to default this value to 1.0, I think.
Oh that’s handy. Can you add a keyboard short-cut to toggle Hide Unused Attributes ? š
I’ll go and see what I am missing, but as I said, I was following the video tutorial exactly, so yes, I am setting all those values! Weird, heh?