Upon installing this good and very useful plugin,
the Gallery tab in the WP image insert popup get corrupted. If you create a post/page, load few images and try to insert them as a gallery... you'll see that the Gallery tab gets corrupted and there is no longer any "Insert gallery" button.
If you disable the plugin, the "Insert gallery" button gets magically back and the gallery tab gets fixed.
Screenshot here: http://img847.imageshack.us/img847/6939/missinggallerybutton.png