I can't reproduce the BTST stuff with a simple example. But when I reversed big games with either POTGO tests or blitterwaits (using BTST.B) it sometimes issued DC.W instead.
I also can crash IRA/lock it with some exes. I have to switch to d68k which I don't like that much.
I'm using an outdated 2010 version. Will upgrade.
A tutorial would be appreciated. As much as this program is appreciated for years