I updated to the newest version of Blocs last night, then went in to work on a project. Now when I try to preview it (Tried Chrome, Firefox & Safari) all I get is the loading icon, but nothing comes up.
I exported the project and tried opening pages directly in a browser and that does not work either.
I opened some other projects to check them and they preview and export just fine, so it is something in the one project.
I turned off use a preloader and that seemed to work. Will clear my browser cache and see if that works also. This project has not been uploaded to a host server yet.