This update doesn't deserve its own new release so I've simply updated the setup file linked to by r60. If you download it after reading this post, you're OK.
Otherwise if you downloaded already before reading this post, you can either download and reinstall, or the only changed file is Sprite's runtime.js - download that file and paste it over <install path>\exporters\html5\plugins\sprite\runtime.js. That should fix it and has the same effect as downloading and reinstalling.
Sorry for the bother!