Disclaimer: I'm a java/scripting guy and not exactly a GDB guru so I have only vague idea of what I'm doing Anyway, I attached gdb on the running doom.x86 executable. Since the Doom 3 is launched via a script and not a genuine executable thingy, I actually 1) launched the plain ol' Doom 3, 2) attached the debugger, then 3) went to Mods, selected TDM, and 4) let it load and crash. (Since TDM doesn't need weird startup parameters, launching TDM via the mods menu has generally worked in the past, as far as I can recall...) And here's what gdm said about this. Doom 3 kept producing output rig