It should be mentioned that with the new tools the old way to get a crash backtrace is changed. I don't know if it's only me, but when I launch from the console (or from a command prompt correctly configured) "GDB MAME.EXE" I get an error message "Module site not loaded". After some investigations, I found that there's in the MinGW \bin\ folder a file called GDBORIG.EXE. Well this last one works as intended.