After reading those steps, I attempted a poor man's version of the procedure: I quit and restarted DisplayLink Manager. Since doing so (approx 2 hours), my screen hasn't gone blank. Previously it would go blank every few minutes.
Not sure if this will work next time (I assume there will be a next time, perhaps after a reboot). But for now, I am happier.
Hope a new version comes along soon that solves this problem.
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