Don't Upgrade to version 2.0 .

This plugin is no longer any good since Photocrati took over! They have ruined a great plugin and have lost a lot of loyal customers. If you can go get version 1.9.13 which is the last stable version of the plugin.
I am giving this a one star since Photocrati has become the developer of this plugin.
If you have previously given this a higher rating I suggest changing it so everyone knows what the current version of the plugin is like. The current 4 star rating is misleading.