Not sure if this is related to just 5.7, I have not needed to adjust any of my plugins in a while. When I click on one of my Publishing Services and select edit. the Publishing Manager will open, and when I click on one of the plugin settings, the manager freezes. I'll actually get a "not responding" in the title bar of the Publishing Manager. Now if I wait 4 to 5 minutes, it will come back and works fine...only freezes when I first start LR. I'm using SmugMug, Flickr, and two Hard Drive Exports. I've tried disabling all Plugins and re-enabling one at a time...doesn't matter, start LR and edit one of the plugins and the Publisher Manger freezes.