diff --git a/code/ZAS/Atom.dm b/code/ZAS/Atom.dm
index b4d1de20af..1a2ad9cb02 100644
--- a/code/ZAS/Atom.dm
+++ b/code/ZAS/Atom.dm
@@ -47,7 +47,7 @@ turf/c_airblock(turf/other)
 	#ifdef ZASDBG
 	ASSERT(isturf(other))
 	#endif
-	if(blocks_air)
+	if(blocks_air || other.blocks_air)
 		return BLOCKED
 
 	//Z-level handling code. Always block if there isn't an open space.
diff --git a/code/ZAS/Connection.dm b/code/ZAS/Connection.dm
index b9cf2278a1..37600dadea 100644
--- a/code/ZAS/Connection.dm
+++ b/code/ZAS/Connection.dm
@@ -76,11 +76,15 @@ Class Procs:
 		edge.add_connection(src)
 
 /connection/proc/mark_direct()
-	state |= CONNECTION_DIRECT
+	if(!direct())
+		state |= CONNECTION_DIRECT
+		edge.direct++
 	//world << "Marked direct."
 
 /connection/proc/mark_indirect()
-	state &= ~CONNECTION_DIRECT
+	if(direct())
+		state &= ~CONNECTION_DIRECT
+		edge.direct--
 	//world << "Marked indirect."
 
 /connection/proc/mark_space()
@@ -110,10 +114,9 @@ Class Procs:
 		erase()
 		return
 	else if(block_status & ZONE_BLOCKED)
-		if(direct())
-			mark_indirect()
-		else
-			mark_direct()
+		mark_indirect()
+	else
+		mark_direct()
 
 	var/b_is_space = !istype(B,/turf/simulated)
 
diff --git a/code/ZAS/ConnectionGroup.dm b/code/ZAS/ConnectionGroup.dm
index 7fab5e94ad..94731228a6 100644
--- a/code/ZAS/ConnectionGroup.dm
+++ b/code/ZAS/ConnectionGroup.dm
@@ -61,6 +61,7 @@ Class Procs:
 /connection_edge/var/zone/A
 
 /connection_edge/var/list/connecting_turfs = list()
+/connection_edge/var/direct = 0
 
 /connection_edge/var/coefficient = 0
 
@@ -69,6 +70,7 @@ Class Procs:
 
 /connection_edge/proc/add_connection(connection/c)
 	coefficient++
+	if(c.direct()) direct++
 	//world << "Connection added: [type] Coefficient: [coefficient]"
 
 /connection_edge/proc/remove_connection(connection/c)
@@ -76,6 +78,7 @@ Class Procs:
 	coefficient--
 	if(coefficient <= 0)
 		erase()
+	if(c.direct()) direct--
 
 /connection_edge/proc/contains_zone(zone/Z)
 
@@ -114,7 +117,6 @@ Class Procs:
 
 
 /connection_edge/zone/var/zone/B
-/connection_edge/zone/var/direct = 0
 
 /connection_edge/zone/New(zone/A, zone/B)
 
@@ -128,11 +130,9 @@ Class Procs:
 /connection_edge/zone/add_connection(connection/c)
 	. = ..()
 	connecting_turfs.Add(c.A)
-	if(c.direct()) direct++
 
 /connection_edge/zone/remove_connection(connection/c)
 	connecting_turfs.Remove(c.A)
-	if(c.direct()) direct--
 	. = ..()
 
 /connection_edge/zone/contains_zone(zone/Z)
diff --git a/code/game/objects/items/stacks/stack.dm b/code/game/objects/items/stacks/stack.dm
index 8e8fb39529..9c23657aca 100644
--- a/code/game/objects/items/stacks/stack.dm
+++ b/code/game/objects/items/stacks/stack.dm
@@ -76,7 +76,7 @@
 				title+= "[R.title]"
 			title+= " ([R.req_amount] [src.singular_name]\s)"
 			if (can_build)
-				t1 += text("<A href='?src=\ref[src];sublist=[recipes_sublist];make=[i]'>[title]</A>  ")
+				t1 += text("<A href='?src=\ref[src];sublist=[recipes_sublist];make=[i];multiplier=1'>[title]</A>  ")
 			else
 				t1 += text("[]", title)
 				continue
@@ -112,7 +112,8 @@
 			recipes_list = srl.recipes
 		var/datum/stack_recipe/R = recipes_list[text2num(href_list["make"])]
 		var/multiplier = text2num(href_list["multiplier"])
-		if (!multiplier) multiplier = 1
+		if (!multiplier || (multiplier <= 0)) //href exploit protection
+			return
 		if (src.amount < R.req_amount*multiplier)
 			if (R.req_amount*multiplier>1)
 				usr << "\red You haven't got enough [src] to build \the [R.req_amount*multiplier] [R.title]\s!"
diff --git a/code/modules/nano/nanomanager.dm b/code/modules/nano/nanomanager.dm
index f3396ecd3f..da546ac66d 100644
--- a/code/modules/nano/nanomanager.dm
+++ b/code/modules/nano/nanomanager.dm
@@ -27,8 +27,9 @@
 		filenames = flist(path)
 		for(var/filename in filenames)
 			if(copytext(filename, length(filename)) != "/") // filenames which end in "/" are actually directories, which we want to ignore
-				asset_files.Add(file(path + filename)) // add this file to asset_files for sending to clients when they connect
-	
+				if(fexists(path + filename))
+					asset_files.Add(fcopy_rsc(path + filename)) // add this file to asset_files for sending to clients when they connect
+
 	return
 
  /**