I did a complete uninstall of ASXP (v.7933) and reinstalled the new version of ASXP12(v.8467).
I pointed to the folder with XP11. Also in the main options in ASXP the menu is marked XP11.
No matter if I run XP11 first and then ASXP12 or in reverse - it always causes CTD.
C172SP default aircraft. I also tried XP11 without any plugins (except default and ASXP).
In XP12, ASXP12 works fine (not to mention there is no option to select MATAR.rwx in the drop-down menu).