Has anyone noticed a case where File > Import Reminders fails to show an "Import Reminders" popup box?

I’m seeing a report of this in a screencast someone made, but I can’t reproduce the problem myself.

I am experiencing this. (I just learned about TaskPaper, and have only been using it for an hour or so.) The first time I tried “Import Reminders” (just to see what it would do), it worked (by asking me if I really wanted to import my reminders, which I actually don’t have because I don’t use Reminders). But then, trying it again has no effect at all - no popup box.