diff --git a/core/assets/shaders/menu.fragment b/core/assets/shaders/menu.fragment
index 47e0584215..d9a9895eb9 100644
--- a/core/assets/shaders/menu.fragment
+++ b/core/assets/shaders/menu.fragment
@@ -1,6 +1,6 @@
 #ifdef GL_ES
-precision mediump float;
-precision mediump int;
+precision highp float;
+precision highp int;
 #endif
 
 uniform sampler2D u_texture;
@@ -8,12 +8,13 @@ uniform vec2 u_resolution;
 uniform float u_time;
 uniform vec2 u_uv;
 uniform vec2 u_uv2;
+uniform float u_scl;
 
 varying vec4 v_color;
 varying vec2 v_texCoord;
 
 void main() {
-    vec2 coords = ((v_texCoord.xy - u_uv) / (u_uv2 - u_uv) - vec2(0.5, 0.5)) * u_resolution;
+    vec2 coords = ((v_texCoord.xy - u_uv) / (u_uv2 - u_uv) - vec2(0.5, 0.5)) * u_resolution/u_scl;
 
 	float roundx = 8.0;
 	float roundy = roundx;
diff --git a/core/src/io/anuke/mindustry/graphics/Shaders.java b/core/src/io/anuke/mindustry/graphics/Shaders.java
index 7479f0fc2e..46d830b08f 100644
--- a/core/src/io/anuke/mindustry/graphics/Shaders.java
+++ b/core/src/io/anuke/mindustry/graphics/Shaders.java
@@ -56,6 +56,7 @@ public class Shaders{
             shader.setUniformf("u_resolution", Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
             shader.setUniformf("u_time", time += Gdx.graphics.getDeltaTime() * 60f);
             shader.setUniformf("u_uv", Draw.getBlankRegion().getU(), Draw.getBlankRegion().getV());
+            shader.setUniformf("u_scl", Unit.dp.scl(1f));
             shader.setUniformf("u_uv2", Draw.getBlankRegion().getU2(), Draw.getBlankRegion().getV2());
         }
     }
diff --git a/core/src/io/anuke/mindustry/io/SaveIO.java b/core/src/io/anuke/mindustry/io/SaveIO.java
index 69a5645382..c1559c74cb 100644
--- a/core/src/io/anuke/mindustry/io/SaveIO.java
+++ b/core/src/io/anuke/mindustry/io/SaveIO.java
@@ -16,7 +16,7 @@ import java.util.zip.InflaterInputStream;
 import static io.anuke.mindustry.Vars.*;
 
 public class SaveIO{
-    public static final IntArray breakingVersions = IntArray.with(47);
+    public static final IntArray breakingVersions = IntArray.with(47, 48, 49, 50, 51, 52);
     public static final IntMap<SaveFileVersion> versions = new IntMap<>();
     public static final Array<SaveFileVersion> versionArray = Array.with(
         new Save16()
diff --git a/core/src/io/anuke/mindustry/maps/Sectors.java b/core/src/io/anuke/mindustry/maps/Sectors.java
index 543e56306a..0402d9893b 100644
--- a/core/src/io/anuke/mindustry/maps/Sectors.java
+++ b/core/src/io/anuke/mindustry/maps/Sectors.java
@@ -8,6 +8,7 @@ import com.badlogic.gdx.utils.Array;
 import io.anuke.mindustry.content.Items;
 import io.anuke.mindustry.core.GameState.State;
 import io.anuke.mindustry.game.Team;
+import io.anuke.mindustry.io.SaveIO;
 import io.anuke.mindustry.maps.generation.WorldGenerator.GenResult;
 import io.anuke.mindustry.maps.missions.BattleMission;
 import io.anuke.mindustry.maps.missions.WaveMission;
@@ -33,12 +34,19 @@ public class Sectors{
     }
 
     public void playSector(Sector sector){
+        if(sector.hasSave() && SaveIO.breakingVersions.contains(sector.getSave().getBuild())){
+            sector.getSave().delete();
+            ui.showInfo("$text.save.old");
+        }
+
         if(!sector.hasSave()){
             world.loadSector(sector);
             logic.play();
             sector.saveID = control.getSaves().addSave("sector-" + sector.packedPosition()).index;
             world.sectors().save();
             world.setSector(sector);
+        }else if(SaveIO.breakingVersions.contains(sector.getSave().getBuild())){
+            ui.showInfo("$text.save.old");
         }else try{
             sector.getSave().load();
             world.setSector(sector);