So if you use another modded apk of the same game version on the same bluestacks version - everything works fine, right? That's good info, so it is not emulator's version or bug, nor it is some kind of new tweaks on game's side. Just in case, do you play on Windows or Mac? Because bluestacks also supports Mac. To locate and fix the issue, any additional info is always good. Who knows what people have in common that blocks the app from starting.