diff --git a/.DS_Store b/.DS_Store
index 6f0edab..002634a 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/EnhancedTerminal.app/Contents/MacOS/EnhancedTerminal b/EnhancedTerminal.app/Contents/MacOS/EnhancedTerminal
index 54d24fc..95de1f9 100755
Binary files a/EnhancedTerminal.app/Contents/MacOS/EnhancedTerminal and b/EnhancedTerminal.app/Contents/MacOS/EnhancedTerminal differ
diff --git a/MainWindowController.swift b/MainWindowController.swift
index 04b9159..0e97976 100644
--- a/MainWindowController.swift
+++ b/MainWindowController.swift
@@ -543,10 +543,18 @@ class MainWindowController: NSWindowController {
     @objc func splitPaneVertically() {
         guard let currentSession = tabManager.getCurrentSession() else { return }
         
+        // If split view exists with wrong orientation, recreate it
+        if let existing = splitView, !existing.isVertical {
+            // Remove and recreate with correct orientation
+            existing.removeFromSuperview()
+            splitView = nil
+            panes = []
+        }
+        
         // Create split view if it doesn't exist
         if splitView == nil {
             splitView = NSSplitView(frame: contentView.bounds)
-            splitView?.isVertical = true
+            splitView?.isVertical = true  // Side-by-side (vertical divider)
             splitView?.dividerStyle = .thin
             splitView?.autoresizingMask = [.width, .height]
             
@@ -577,10 +585,18 @@ class MainWindowController: NSWindowController {
     @objc func splitPaneHorizontally() {
         guard let currentSession = tabManager.getCurrentSession() else { return }
         
+        // If split view exists with wrong orientation, recreate it
+        if let existing = splitView, existing.isVertical {
+            // Remove and recreate with correct orientation
+            existing.removeFromSuperview()
+            splitView = nil
+            panes = []
+        }
+        
         // Create split view if it doesn't exist
         if splitView == nil {
             splitView = NSSplitView(frame: contentView.bounds)
-            splitView?.isVertical = false
+            splitView?.isVertical = false  // Top-bottom (horizontal divider)
             splitView?.dividerStyle = .thin
             splitView?.autoresizingMask = [.width, .height]