diff --git a/README.md b/README.md
index 2444399..1b97518 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ## Outline
 
-Tortuga is a 2D multiplayer JRPG featuring permadeath, with an emphasis on multiplayer cooperation, exploration and customization. The game runs on customizable public and private servers.
+Tortuga is a 2D MMORPG featuring permadeath, with an emphasis on multiplayer cooperation, exploration and customization. The game runs on customizable public and private servers.
 
 This game is inspired by classic 2D RPGs (Final Fantasy, The Legend of Zelda), as well as more modern sandboxes amd MMOs (Minecraft, EVE Online). This project is currently independently created and funded, with the goal of creating a game that will engage the players and inspire a large community.
 
diff --git a/client/gameplay_scenes/world_logic.cpp b/client/gameplay_scenes/world_logic.cpp
index 4c724fb..c0ff20e 100644
--- a/client/gameplay_scenes/world_logic.cpp
+++ b/client/gameplay_scenes/world_logic.cpp
@@ -125,8 +125,16 @@ void World::Update() {
 		it.second.Update();
 	}
 
-	//update the map
-	UpdateMap();
+	try {
+		//update the map
+		UpdateMap();
+	}
+	catch(terminal_error& e) {
+		throw(e);
+	}
+	catch(std::exception& e) {
+		std::cerr << "UpdateMap Error: " << e.what() << std::endl;
+	}
 
 	//skip the rest without a local character
 	if (!localCharacter) {
@@ -162,6 +170,11 @@ void World::Render(SDL_Surface* const screen) {
 	//draw the map
 	for (std::list<Region>::iterator it = regionPager.GetContainer()->begin(); it != regionPager.GetContainer()->end(); it++) {
 		tileSheet.DrawRegionTo(screen, &(*it), camera.x, camera.y);
+
+		//debugging
+//		std::ostringstream msg;
+//		msg << it->GetX() << ", " << it->GetY();
+//		font.DrawStringTo(msg.str(), screen, it->GetX() * tileSheet.GetImage()->GetClipW() - camera.x, it->GetY() * tileSheet.GetImage()->GetClipH() - camera.y);
 	}
 
 	//draw the entities
diff --git a/client/gameplay_scenes/world_map.cpp b/client/gameplay_scenes/world_map.cpp
index 592c8e9..1265281 100644
--- a/client/gameplay_scenes/world_map.cpp
+++ b/client/gameplay_scenes/world_map.cpp
@@ -23,6 +23,24 @@
 
 #include "channels.hpp"
 
+#include <sstream>
+
+//-------------------------
+//static functions
+//-------------------------
+
+static int regionChecksum(Region* const region) {
+	int sum = 0;
+	for(int i = 0; i < REGION_WIDTH; i++) {
+		for (int j = 0; j < REGION_HEIGHT; j++) {
+			for (int k = 0; k < REGION_DEPTH; k++) {
+				sum += region->GetTile(i, j, k);
+			}
+		}
+	}
+	return sum;
+}
+
 //-------------------------
 //map management
 //-------------------------
@@ -40,6 +58,13 @@ void World::SendRegionRequest(int roomIndex, int x, int y) {
 }
 
 void World::hRegionContent(RegionPacket* const argPacket) {
+	//checksum
+	if (regionChecksum(argPacket->region) == 0) {
+		std::ostringstream msg;
+		msg << "Received region checksum failed: " << argPacket->x << ", " << argPacket->y;
+		throw(std::runtime_error(msg.str()));
+	}
+
 	//replace existing regions
 	regionPager.UnloadIf([&](Region const& region) -> bool {
 		return region.GetX() == argPacket->x && region.GetY() == argPacket->y;
@@ -71,9 +96,23 @@ void World::UpdateMap() {
 	//request empty regions within this zone
 	for (int i = xStart; i <= xEnd; i += REGION_WIDTH) {
 		for (int j = yStart; j <= yEnd; j += REGION_HEIGHT) {
-			if (!regionPager.FindRegion(i, j)) {
+			Region* region = regionPager.FindRegion(i, j);
+			if (!region) {
+				//request absent region
 				SendRegionRequest(roomIndex, i, j);
 			}
+			else if (regionChecksum(region) == 0) {
+				//checksum failed
+				//NOTE: this patches bug #45, but does not resolve it
+				regionPager.UnloadIf([region](Region const& ref) -> bool {
+					//remove the erroneous region
+					return region == &ref;
+				});
+				SendRegionRequest(roomIndex, i, j);
+				std::ostringstream msg;
+				msg << "Existing region checksum failed: " << roomIndex << ", " << i << ", " << j;
+				throw(std::runtime_error(msg.str()));
+			}
 		}
 	}
 }
\ No newline at end of file
diff --git a/common/map/region_pager_base.cpp b/common/map/region_pager_base.cpp
index 1df6864..857dabd 100644
--- a/common/map/region_pager_base.cpp
+++ b/common/map/region_pager_base.cpp
@@ -70,6 +70,7 @@ Region* RegionPagerBase::FindRegion(int x, int y) {
 }
 
 Region* RegionPagerBase::PushRegion(Region* const ptr) {
+	//BUG: #45 Some regions are occasionally losing their tile data
 	regionList.push_front(*ptr);
 	return &regionList.front();
 }
diff --git a/rsc/scripts/map_maker.lua b/rsc/scripts/map_maker.lua
index dbcc2ec..d2a7f4e 100644
--- a/rsc/scripts/map_maker.lua
+++ b/rsc/scripts/map_maker.lua
@@ -65,6 +65,9 @@ end
 
 --custom generation systems here
 function mapMaker.DebugIsland(r)
+	--debug
+	io.write("map_maker:DebugIsland(", regionAPI.GetX(r), ", ", regionAPI.GetY(r), ")\n")
+
 	--basic distance check for each tile, placing an island around the world origin
 	for i = 1, regionAPI.GetWidth(r) do
 		for j = 1, regionAPI.GetHeight(r) do
@@ -95,6 +98,9 @@ function mapMaker.DebugIsland(r)
 end
 
 function mapMaker.DebugGrassland(r)
+	--debug
+	io.write("map_maker:DebugGrassland(", regionAPI.GetX(r), ", ", regionAPI.GetY(r), ")\n")
+
 	--all dirt
 	for i = 1, regionAPI.GetWidth(r) do
 		for j = 1, regionAPI.GetHeight(r) do
diff --git a/rsc/scripts/map_saver.lua b/rsc/scripts/map_saver.lua
index b28d1bd..2ec8832 100644
--- a/rsc/scripts/map_saver.lua
+++ b/rsc/scripts/map_saver.lua
@@ -4,11 +4,11 @@ local mapSaver = {}
 
 function mapSaver.Load(r)
 	--empty
-	io.write("map_saver:Load(", region.GetX(r), ", ", region.GetY(r), ")\n")
+--	io.write("map_saver:Load(", region.GetX(r), ", ", region.GetY(r), ")\n")
 end
 function mapSaver.Save(r)
 	--empty
-	io.write("map_saver:Save(", region.GetX(r), ", ", region.GetY(r), ")\n")
+--	io.write("map_saver:Save(", region.GetX(r), ", ", region.GetY(r), ")\n")
 end
 
 --TODO: (3) create a flexible saving & loading system
diff --git a/rsc/scripts/setup_server.lua b/rsc/scripts/setup_server.lua
index 02f5059..5c55900 100644
--- a/rsc/scripts/setup_server.lua
+++ b/rsc/scripts/setup_server.lua
@@ -31,6 +31,6 @@ local underworld, uidTwo = roomManagerAPI.CreateRoom("underworld", "overworld.bm
 roomAPI.Initialize(underworld, mapSaver.Load, mapSaver.Save, mapMaker.DebugGrassland, mapSaver.Save)
 
 --call the monstrosity
-doorUtility.createDoorPair("pair 1", overworld, 0, -64, underworld, 0, 0)
+doorUtility.createDoorPair("pair 1", overworld, -64, -64, underworld, 64, 64)
 
 print("Finished the lua script")
diff --git a/server/rooms/room_data.cpp b/server/rooms/room_data.cpp
index fd0c7e7..dcb544c 100644
--- a/server/rooms/room_data.cpp
+++ b/server/rooms/room_data.cpp
@@ -26,6 +26,7 @@
 #include <stack>
 #include <stdexcept>
 
+//TODO: (9) character collisions should be preformed client-side
 void RoomData::RunFrame() {
 	//get the hook
 	lua_rawgeti(lua, LUA_REGISTRYINDEX, tickRef);