I also had similar problem. My conclusion is that Editor loading gets stuck at 70% if segfault happens in constructor of some of your classes. To my understanding, the constructors are called by editor to retrieve default values of properties and this is done either during loading of the Editor or right after recompiling of your project. Just fix the code that causes segfault in constructor, recompile the project externally (in Visual in my case) and your project will be alive again.