diff --git a/pages/index.vue b/pages/index.vue
index 1747b58..16725c5 100644
--- a/pages/index.vue
+++ b/pages/index.vue
@@ -321,7 +321,7 @@
                 </button>
               </div>
             </div>
-            <p v-if="useIdentityRefs" class="text-xs text-zinc-500">Picture 1 is the start still. Extra stills map to Picture 2–5 in MiniMax. Empty slots are omitted. Identity refs are not reused on queued extensions.</p>
+            <p v-if="useIdentityRefs" class="text-xs text-zinc-500">Picture 1 is the start still. Extra stills map to Picture 2–5. Empty extra slots reuse the start still so Comfy does not error. Identity refs are not reused on queued extensions.</p>
           </div>
         </div>
 
diff --git a/server/assets/workflow_minimax_video_v2.json b/server/assets/workflow_minimax_video_v2.json
index d8a386f..4b87b34 100644
--- a/server/assets/workflow_minimax_video_v2.json
+++ b/server/assets/workflow_minimax_video_v2.json
@@ -3,7 +3,6 @@
     "inputs": {
       "filename_prefix": "video/MiniMax_H3",
       "format": "auto",
-      "format.codec": "auto",
       "codec": "auto",
       "video": [
         "172",
diff --git a/server/utils/comfy.ts b/server/utils/comfy.ts
index 2c3c1cf..82922af 100644
--- a/server/utils/comfy.ts
+++ b/server/utils/comfy.ts
@@ -77,6 +77,29 @@ export function comfyInputFilename(original: string, jobId?: string) {
   return `aigen_${id}_${base}${ext}`
 }
 
+function comfyQueueMessage(payload: unknown, status: number) {
+  const body = payload as {
+    error?: { message?: string; details?: string }
+    node_errors?: Record<string, {
+      class_type?: string
+      errors?: Array<{ message?: string; details?: string; extra_info?: { input_name?: string } }>
+    }>
+  }
+  const parts: string[] = []
+  const headline = String(body.error?.message || '').trim()
+  const extra = String(body.error?.details || '').trim()
+  if (headline) parts.push(headline)
+  if (extra) parts.push(extra)
+  for (const [id, node] of Object.entries(body.node_errors || {})) {
+    for (const item of node.errors || []) {
+      const bit = [item.message, item.details, item.extra_info?.input_name].filter(Boolean).join(' — ')
+      if (bit) parts.push(`${node.class_type || `Node ${id}`}: ${bit}`)
+    }
+  }
+  const message = [...new Set(parts.filter(Boolean))].join('. ')
+  return message || `Queue failed (${status})`
+}
+
 export async function queuePrompt(graph: unknown, clientId: string) {
   const res = await comfyFetch('/prompt', {
     method: 'POST',
@@ -85,10 +108,7 @@ export async function queuePrompt(graph: unknown, clientId: string) {
   })
   const payload = await res.json().catch(() => ({}))
   if (!res.ok) {
-    const message = (payload as { error?: { message?: string } }).error?.message
-      || (payload as { node_errors?: unknown }).node_errors
-      || `Queue failed (${res.status})`
-    throw createError({ statusCode: 502, statusMessage: String(message), data: payload })
+    throw createError({ statusCode: 502, statusMessage: comfyQueueMessage(payload, res.status), data: payload })
   }
   return payload as { prompt_id: string; number?: number }
 }
diff --git a/server/utils/workflow.ts b/server/utils/workflow.ts
index 37e0d87..e005a31 100644
--- a/server/utils/workflow.ts
+++ b/server/utils/workflow.ts
@@ -234,13 +234,8 @@ function applyV2IdentityPath(
       graph['176'].inputs.lora_name = 'minimax_h3_ref2v_turbo_4step_v0.1_comfyui_bf16.safetensors'
     }
     V2_REF_LOADERS.forEach((id, index) => {
-      const name = refs[index]
-      if (name && graph[id]) {
-        graph[id].inputs.image = name
-        return
-      }
-      delete graph[id]
-      if (graph['155']?.inputs) delete graph['155'].inputs[`ref_images.ref_image_${index + 1}`]
+      if (!graph[id]) return
+      graph[id].inputs.image = refs[index] || params.imageName
     })
     if (graph['150']?.inputs) graph['150'].inputs.value = true
     return