From 6ee9489a5fcfbbe74510836af6e12220006d611e Mon Sep 17 00:00:00 2001
From: Ross <xkjq@ymail.com>
Date: Mon, 13 Oct 2025 09:56:26 +0100
Subject: [PATCH] Add debug logging for thumbnail generation and improve error
 handling

---
 dicom-viewer/src/App.tsx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dicom-viewer/src/App.tsx b/dicom-viewer/src/App.tsx
index 8be1810..4b75a05 100644
--- a/dicom-viewer/src/App.tsx
+++ b/dicom-viewer/src/App.tsx
@@ -437,6 +437,7 @@ function App({ container_id, imageStacks, autoCacheStack, annotationJson, viewer
     }
     // avoid regenerating
     if (stackThumbnails[stackIdx]) {
+      console.debug('generateThumbnail: thumbnail already exists for', stackIdx);
       // already have it
       return;
     }
@@ -551,7 +552,9 @@ function App({ container_id, imageStacks, autoCacheStack, annotationJson, viewer
       console.warn('Thumbnail generation failed for', chosenImageId, err);
       try { setStackThumbnails(prev => ({ ...prev, [stackIdx]: 'BROKEN' })); } catch (e) { /* ignore */ }
     } finally {
-      try { renderingEngine.disableElement(viewportId); } catch (e) { /* ignore */ }
+      try { renderingEngine.disableElement(viewportId); } catch (e) { 
+        console.warn('Failed to disable thumbnail element:', e);
+       }
       if (el && el.parentNode) el.parentNode.removeChild(el);
     }
   }, [container_id, stackThumbnails]);