It was driving me crazy trying to figure out why "Quick Edit" suddenly stopped working on me until I discovered that I needed to disable this plugin.
I'm not sure why, but I haven't been able to change the Post-date to Schedule a post to appear at a specific time, ever since WP2.0. My work-around has been to go to the List of All Posts and click "Quick Edit" to change the time/date before submitting.
With "Google Libraries" installed, when I click on "Quick Edit", the post vanishes from the list (Refreshing the screen brings it back). Only temporarily disabling Google Libraries prevents this from happening. Very annoying.
Otherwise, the plugin appears to work fine.