one

code/game/machinery/computer/apc_control.dm

@@ -185,15 +185,19 @@
 	ui_interact(usr) //Refresh the UI after a filter changes
 
 /obj/machinery/computer/apc_control/emag_act(mob/user)
+	. = ..()
 	if(!authenticated)
 		to_chat(user, "<span class='warning'>You bypass [src]'s access requirements using your emag.</span>")
 		authenticated = TRUE
 		log_activity("logged in")
-	else if(!(obj_flags & EMAGGED))
+	else
+		if(obj_flags & EMAGGED)
+			return
 		user.visible_message("<span class='warning'>You emag [src], disabling precise logging and allowing you to clear logs.</span>")
 		log_game("[key_name(user)] emagged [src] at [AREACOORD(src)], disabling operator tracking.")
 		obj_flags |= EMAGGED
-	playsound(src, "sparks", 50, 1)
+		playsound(src, "sparks", 50, 1)
+	return TRUE
 
 /obj/machinery/computer/apc_control/proc/log_activity(log_text)
 	var/op_string = operator && !(obj_flags & EMAGGED) ? operator : "\[NULL OPERATOR\]"

code/game/machinery/computer/arcade.dm

@@ -292,6 +292,7 @@
 
 
 /obj/machinery/computer/arcade/battle/emag_act(mob/user)
+	. = ..()
 	if(obj_flags & EMAGGED)
 		return
 	to_chat(user, "<span class='warning'>A mesmerizing Rhumba beat starts playing from the arcade machine's speakers!</span>")
@@ -310,6 +311,7 @@
 
 
 	updateUsrDialog()
+	return TRUE
 
 
 
@@ -1049,6 +1051,7 @@
 	desc = "Learn how our ancestors got to Orion, and have fun in the process!"
 
 /obj/machinery/computer/arcade/orion_trail/emag_act(mob/user)
+	. = ..()
 	if(obj_flags & EMAGGED)
 		return
 	to_chat(user, "<span class='notice'>You override the cheat code menu and skip to Cheat #[rand(1, 50)]: Realism Mode.</span>")
@@ -1056,6 +1059,7 @@
 	desc = "Learn how our ancestors got to Orion, and try not to die in the process!"
 	newgame()
 	obj_flags |= EMAGGED
+	return TRUE
 
 /mob/living/simple_animal/hostile/syndicate/ranged/smg/orion
 	name = "spaceport security"

code/game/machinery/computer/communications.dm

@@ -431,6 +431,7 @@
 		return ..()
 
 /obj/machinery/computer/communications/emag_act(mob/user)
+	. = ..()
 	if(obj_flags & EMAGGED)
 		return
 	obj_flags |= EMAGGED
@@ -439,6 +440,7 @@
 		authenticated = 2
 	to_chat(user, "<span class='danger'>You scramble the communication routing circuits!</span>")
 	playsound(src, 'sound/machines/terminal_alert.ogg', 50, 0)
+	return TRUE
 
 /obj/machinery/computer/communications/ui_interact(mob/user)
 	. = ..()