Doitsu is correct. The Tcl that comes with OS X is broken. That's why KevinH recommends installing Activestate's Tcl before running/installing Sigil plugins (at least he ones that have tkinter gui components).
And yes, this plugin is the equivalent of the "Span/Div Editor" portion of my "Diaps EditorToolbag" plugin for calibre's editor. There's a separate PunctuationSmarten plugin that provides the rest of the functionality from the "Toolbag".
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