Hey -
I’ve reported the issue of not being able to save after hot reloading with a plugin in the project (UE-18307). I did notice that trying to compile the Visual Studio solution with the editor open would fail however closing the editor and building again would succeed. I’m not sure if this is related however it seems there is a bad reference somewhere when compiling with the editor open. I also found that the save issue only occurs while the reference to the plugin exists in the project. Removing the Create Index node will allow the project to be saved and putting the node back will continue to save properly until the next hot reload.