When this plugin is enabled, I've noticed that post pagination in the WP admin seems to get screwed up. Two things happen...
1) Instead of saying Displaying "1–20 of 208" posts for instance, it reads "Displaying 1–0 of 208"
2) The second thing, if you you try and change the number of posts displayed (Screen Options > Show on screen)... no matter what it's always the default. Setting to a value of 1, 100, etc takes no effect.
This happens for "Posts" posts as well as custom post types.
This is my favorite drag&drop post order plugin I've come across. Thanks for creating it.