diff --git a/index.html b/index.html
index cc20764..62cd013 100644
--- a/index.html
+++ b/index.html
@@ -524,7 +524,6 @@
             </div>
             
             <div style="display: flex; gap: 10px; margin-top: 10px;">
-                <button id="update-ranges-btn" class="begin-mapping-btn" style="flex: 1;">Update Ranges</button>
                 <button id="begin-mapping-btn" class="begin-mapping-btn" style="flex: 1;">Begin Mapping</button>
             </div>
         </div>
diff --git a/main.js b/main.js
index 7d48470..ff0af5f 100644
--- a/main.js
+++ b/main.js
@@ -49,8 +49,6 @@ function createWindow() {
     }, 1000);
   }
 
-  // Open the DevTools.
-  mainWindow.webContents.openDevTools();
 }
 
 // IPC handler for selecting directory
diff --git a/renderer.js b/renderer.js
index 7576c5c..62f5802 100644
--- a/renderer.js
+++ b/renderer.js
@@ -11,7 +11,6 @@ const showDetailsEl = document.getElementById('show-details');
 const progressContainer = document.getElementById('progress-container');
 const progressText = document.getElementById('progress-text');
 const progressCount = document.getElementById('progress-count');
-const updateRangesBtn = document.getElementById('update-ranges-btn');
 
 // Current state
 let currentDirectory = null;
@@ -20,6 +19,7 @@ let currentShow = null;
 let currentSeasons = [];
 let currentEpisodes = [];
 let selectedSeasonEpisodeCount = 0;
+let isUpdatingEpisodeNumbers = false;
 
 // Event Listeners
 selectDirBtn.addEventListener('click', selectDirectory);
@@ -33,13 +33,7 @@ document.addEventListener('click', function(e) {
   }
 });
 
-// Add click handler for Update Ranges button
-if (updateRangesBtn) {
-  updateRangesBtn.addEventListener('click', function() {
-    updateEpisodeNumbers();
-    checkEpisodeCountMatch();
-  });
-}
+
 
 // Add click handler for Begin Mapping button
 document.getElementById('begin-mapping-btn').addEventListener('click', beginMapping);
@@ -449,30 +443,41 @@ function handleDrop(e) {
 }
 
 function updateEpisodeNumbers() {
-  const fileItems = fileListEl.querySelectorAll('.file-item:not(.folder-item)');
-  let episodeNum = 1;
+  if (isUpdatingEpisodeNumbers) {
+    console.log('[updateEpisodeNumbers] Already updating, skipping re-entrant call');
+    return;
+  }
   
-  console.log('[updateEpisodeNumbers] Starting with episodeNum:', episodeNum);
-  console.log('[updateEpisodeNumbers] Total items:', fileItems.length);
-  console.trace('[updateEpisodeNumbers] Call stack');
+  isUpdatingEpisodeNumbers = true;
   
-  fileItems.forEach((item, index) => {
-    const episodeEl = item.querySelector('.episode-number');
-    if (episodeEl) {
-      const storedStart = episodeEl.dataset.episodeStart;
-      const storedEnd = episodeEl.dataset.episodeEnd;
-      console.log(`[updateEpisodeNumbers] Item ${index}: storedStart="${storedStart}", storedEnd="${storedEnd}"`);
-      
-      const start = storedStart ? parseInt(storedStart) : episodeNum;
-      const end = storedEnd ? parseInt(storedEnd) : start;
-      
-      const rangeText = start === end ? `${start}` : `${start}-${end}`;
-      episodeEl.textContent = rangeText;
-      episodeEl.dataset.episode = episodeNum;
-      console.log(`[updateEpisodeNumbers] Item ${index}: calculated start=${start}, end=${end}, display=${rangeText}, next episodeNum=${end + 1}`);
-      episodeNum = end + 1;
-    }
-  });
+  try {
+    const fileItems = fileListEl.querySelectorAll('.file-item:not(.folder-item)');
+    let episodeNum = 1;
+    
+    console.log('[updateEpisodeNumbers] Starting with episodeNum:', episodeNum);
+    console.log('[updateEpisodeNumbers] Total items:', fileItems.length);
+    console.trace('[updateEpisodeNumbers] Call stack');
+    
+    fileItems.forEach((item, index) => {
+      const episodeEl = item.querySelector('.episode-number');
+      if (episodeEl) {
+        const storedStart = episodeEl.dataset.episodeStart;
+        const storedEnd = episodeEl.dataset.episodeEnd;
+        console.log(`[updateEpisodeNumbers] Item ${index}: storedStart="${storedStart}", storedEnd="${storedEnd}"`);
+        
+        const start = storedStart ? parseInt(storedStart) : episodeNum;
+        const end = storedEnd ? parseInt(storedEnd) : start;
+        
+        const rangeText = start === end ? `${start}` : `${start}-${end}`;
+        episodeEl.textContent = rangeText;
+        episodeEl.dataset.episode = episodeNum;
+        console.log(`[updateEpisodeNumbers] Item ${index}: calculated start=${start}, end=${end}, display=${rangeText}, next episodeNum=${end + 1}`);
+        episodeNum = end + 1;
+      }
+    });
+  } finally {
+    isUpdatingEpisodeNumbers = false;
+  }
 }
 
 // Make an episode number editable for range editing