Well,I have not used Source from GitHub in any of Projects. All my levels was created in standard “Blueprint Empty level”.
This is the screenshot of 4.9.2 version of self project level
Version 4.8.3 version does not differ , all as standard. This issue appears cause the standard map like: Minimal Default or 3rd person not found, I think the path to this map is like C:/Program Files/Unreal engine/etc., but own projects has some different path like: C:/Document/Unreal Projects/etc. and when I restart me PC, this path was lost by Engine, and I have this error. For now Im resolve this problem, but on the final step like compile project, I think it will give me any unexpected error.
If u want, I can give u my project for check, uploaded maybe on Google Drive etc. But I don`t know how to make this safety.