diff --git a/api/get_stats.php b/api/get_stats.php
index 38156f2..2d9f332 100644
--- a/api/get_stats.php
+++ b/api/get_stats.php
@@ -40,12 +40,19 @@ try {
     
     // Total de mensajes
     $totalconversations = $db->fetch("SELECT COUNT(*) as count FROM conversations")['count'];
+
+    // Mensajes pendientes / no leídos: preferir columna is_read si existe, si no usar status = 'received'
+    $unreadResult = $db->fetch(
+        "SELECT COUNT(*) as count FROM conversations WHERE direction = 'incoming' AND ( (is_read IS NULL OR is_read = 0) OR status = 'received' )"
+    );
+    $unreadMessages = intval($unreadResult['count'] ?? 0);
     
     $stats = [
         'total_users' => (int)$totalUsers,
         'conversations_today' => (int)$conversationsToday,
         'active_users' => (int)$activeUsers,
-        'total_conversations' => (int)$totalconversations
+        'total_conversations' => (int)$totalconversations,
+        'unread_messages' => $unreadMessages
     ];
     
     echo json_encode($stats);
diff --git a/api/upload_media.php b/api/upload_media.php
index e4c7244..b36402b 100644
--- a/api/upload_media.php
+++ b/api/upload_media.php
@@ -6,9 +6,17 @@
 
 require_once '../config/config.php';
 
+// Asegurar que errores no se impriman al cliente y se registren en logs
+error_reporting(E_ALL);
+@ini_set('display_errors', 0);
+@ini_set('log_errors', 1);
+
 // Verificar autenticación
 requireAuthentication();
 
+// Forzar buffer para poder limpiar salidas accidentales
+if (ob_get_level() === 0) ob_start();
+
 header('Content-Type: application/json; charset=utf-8');
 header('Access-Control-Allow-Origin: *');
 header('Access-Control-Allow-Methods: POST');
@@ -23,7 +31,13 @@ if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
 try {
     // Verificar que se subió un archivo
     if (!isset($_FILES['file']) || $_FILES['file']['error'] !== UPLOAD_ERR_OK) {
-        throw new Exception('No se recibió ningún archivo o hubo un error en la carga');
+        // Log for debugging
+        error_log('upload_media.php - FILES content: ' . print_r($_FILES, true));
+        // Make sure any buffered content is cleared before sending JSON
+        if (ob_get_length()) ob_clean();
+        http_response_code(400);
+        echo json_encode(['success' => false, 'error' => 'No se recibió ningún archivo o hubo un error en la carga']);
+        exit;
     }
     
     $file = $_FILES['file'];
diff --git a/assets/js/app.js b/assets/js/app.js
index 6693801..c05a904 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -194,10 +194,10 @@ class WhatsAppBotManager {
             document.getElementById('active-users').textContent = stats.active_users || 0;
             document.getElementById('total-conversations').textContent = stats.total_conversations || 0;
 
-            // Actualizar badge de conversaciones en el menú lateral
+            // Actualizar badge de conversaciones en el menú lateral (usar mensajes pendientes si existe)
             const convBadge = document.getElementById('conversations-count');
             if (convBadge) {
-                const val = stats.total_conversations || 0;
+                const val = (typeof stats.unread_messages !== 'undefined') ? stats.unread_messages : (stats.total_conversations || 0);
                 convBadge.textContent = val;
                 convBadge.style.display = val > 0 ? 'inline-block' : 'none';
             }
diff --git a/assets/js/app_simple.js b/assets/js/app_simple.js
index b6eacec..72713bd 100644
--- a/assets/js/app_simple.js
+++ b/assets/js/app_simple.js
@@ -274,10 +274,10 @@ class SimpleWhatsAppManager {
                 }
             });
 
-            // Actualizar badge de conversaciones en el menú lateral (compatibilidad con versión simple)
+            // Actualizar badge de conversaciones en el menú lateral (usar mensajes pendientes si existe)
             const convBadge = document.getElementById('conversations-count');
             if (convBadge) {
-                const val = stats.total_conversations || 0;
+                const val = (typeof stats.unread_messages !== 'undefined') ? stats.unread_messages : (stats.total_conversations || 0);
                 convBadge.textContent = val;
                 convBadge.style.display = val > 0 ? 'inline-block' : 'none';
             }
diff --git a/chat_window.php b/chat_window.php
index bfc06a7..6579d5c 100644
--- a/chat_window.php
+++ b/chat_window.php
@@ -530,8 +530,11 @@ if (empty($user_id)) {
                     }
                     return JSON.parse(text);
                 } catch (err) {
+                    // Incluir parte del cuerpo en el error para ayudar al diagnóstico (truncado)
                     console.error('apiCall parse error for', url, err);
-                    throw new Error('Invalid JSON response from ' + url + ': ' + err.message);
+                    const respText = await response.text().catch(() => '');
+                    const snippet = (respText && respText.length > 0) ? respText.substr(0, 1000) : '<no body available>';
+                    throw new Error('Invalid JSON response from ' + url + ': ' + err.message + ' -- response snippet: ' + snippet);
                 }
             }
         }