I posted a plea for troubleshooting
directly to the forum before I realized this thread was probably the best place for it. Sorry!
Anyway, I have a bug where I selected a font that made the plugin freeze. I had to force close the plugin and now whenever I try to open the plugin, calibre freezes. I can't unselect the font and I can't recall the font name, so I'm at a bit of a loss. Uninstalling and reinstalling the plugin (multiple times) hasn't helped.