@IStartedSomething
Which Kickstart 3.1 are you using? And which version of Workbench does the HDF contain? I think you get a red screen if you combine the wrong Kickstart with the Workbench you are using (for example A500/2000 Kickstart 3.1 with Amiga 1200/4000 Workbench 3.1).
Don´t think it's the kickstart, it must have something to do with the things that get loaded after boot !
I got these problems also, with all kind of HDFs I throw at the A600GS but it´s weird, because if I install the same OS with the same Kickstart ON the A600GS itself everything works !
Example :
Installed OS3.9 on a 1GB HDF with Kick 3.1 A1200 (40.068) on WinUAE, put it on the A600GS -> Red Screen
Used an EMPTY HDF 1GB with the SAME Kick 3.1 and installed OS 3.9 on the A600GS -> works
I always wanted to deep dive into bug search but I have very minor spare time in the moment