I noticed that when this plugin is active, then I'm unable to expand/collapse the menus on Pages/Posts edit, such as Publish, Categories, Tags etc. on the "Edit Post" page.
I also cannot click the "Delete" link on the Plugins page.
Once deactivating this plugin, all the above is working again.
I tested in: Safari and Chrome on Mac. Firefox and Internet Explorer on Windows. Same problem all 4 browsers.