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Also, figured I'd include the two scripts (release and release confirm). Here is first:

///mev_pause_monsters_release() function mev_pause_monsters_release() {     with(instance_create_depth(x,y,depth-1,obj_gguimenu)){         daddy       = other.id         my_monster    = other.my_monster         ggui_frame(other.ggui_frame_l[0] + 96,other.ggui_frame_t[0] + 48,128,64,spr_messagebox)         ggui_menu_preallocate(1,2)         ggui_element_text_settings(font_mainmsg,c_white,0,0)         ggui_menu_add_option_text(mev_pause_monsters_release_confirm, "Release", "")         ggui_menu_add_option_text(mev_cancel, "Cancel",    "")     }  }

and the second:

///mev_pause_monsters_release_confirm() function mev_pause_monsters_release_confirm() {     show_debug_message("Update:" + string(daddy.daddy))     with(obj_gguimenu){       show_debug_message(tsprintf("ID: %, %x%",id,menu_w,menu_h))     }         daddy = other.id         message_spawn(tsprintf("You released %.",amp_get_monster_name(my_monster)))         array_delete(global.active_monster_party,my_monster,1)         array_insert(global.active_monster_party,AMP_FIRST_ACTIVE + PARTYSIZE_ACTIVE - 1,[])         amp_clear_monster(AMP_FIRST_ACTIVE + PARTYSIZE_ACTIVE - 1)         with(daddy.daddy){             msh_spawn_monster_list(mev_pause_monsters)         }         instance_destroy(daddy)         instance_destroy()  }
(+1)

It looks like the ID is right in the printout, but we change it later (and then there's no second printout when we UPDATE daddy.daddy, so the reference is to something that doesn't exist?) so I think changing mev_pause_release_confirm like this should fix it:

///mev_pause_monsters_release_confirm() function mev_pause_monsters_release_confirm() {     var granddad = daddy.daddy;              message_spawn(tsprintf("You released %.",amp_get_monster_name(my_monster)))         array_delete(global.active_monster_party,my_monster,1)         array_insert(global.active_monster_party,AMP_FIRST_ACTIVE + PARTYSIZE_ACTIVE - 1,[])         amp_clear_monster(AMP_FIRST_ACTIVE + PARTYSIZE_ACTIVE - 1)         with(granddad){             msh_spawn_monster_list(mev_pause_monsters)         }         instance_destroy(daddy)         instance_destroy()  }
(+1)

It seems like that has fixed it. Thank you for all your help.