Version 0.2.3 is available for download, the documentation will be updated next week and a new page will describre how to write a skin for this plugin.
If you found a bug, please write a comment for this post (and not for the documentation page of the plugin).
Notice : after upgrading the plugin, don’t forget to save the configuration of the plugin. After this update, reopen the configuration of the plugin and put a delay time for smoothgallery (for example 500) ! If you don’t do this, rendering with smoothgallery won’t work (it will fix it soon).