The problem is reproduced when you use the in-dialog "Close" button to dismiss the dialog. Clicking your window manager's "X" button doesn't reproduce the problem.
The root cause is that the "Close" button calls destroy() on the dialog, and the underlying DialogBox doesn't like this, because it calls WaitVariable and waits forever. Instead, I set the "selected_button" attribute of the DialogBox, which causes the DialogBox to close itself gracefully.
I've uploaded Tk::TOTD 0.3 to CPAN that fixes this issue.
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