AmBr: Yes I noticed this issue. This is because you're not using a 3.1 Kickstart
So it's not really true that it's working on a "stock A600" because it needs the Kickstart 3.1
Loading(R) means that low memory has been detected and it's going to use the RAD disk to launch your game but even if Tiny Launcher doesn't need the RAD driver on your local drive, *I THINK* it needs the Kickstart 3.1 at least...
I think I'm going to put back TinyLauncherSE in download, it works with the Kickstart 2.0.
Sorry about that.