When you're unable to preview certain images by double-clicking or viewing them in detail mode, this typically happens due to specific file issues. Here's what might be causing the problem and how to fix it.

Common causes

The original file is missing or sync tool hasn't completed synchronization
The original filename doesn't match what's recorded in Eagle

Troubleshooting steps

If you're using sync tools: First check this troubleshooting guide to ensure all library files have been synchronized to your local disk.
Check the file location: Right-click on the problematic file and select "Open in File Explorer/Finder". Verify that the image's info folder contains the three required files: original file, thumbnail, and metadata.json record file.
Fix thumbnail issues: If the original file exists but has a different filename than what's recorded in Eagle, select the problematic file in Eagle, then hold Ctrl + left-click on the library name in the top-left corner, and select "Repair thumbnails of selected items".
Repair damaged metadata: Use Ctrl + left-click on the library name to access hidden repair tools, then select "Repair damaged metadata.json files". This function scans all files in your library and attempts to recover images that still have their original files but display incorrectly.
Clean up invalid content: Access the hidden repair tools again and select "Scan and remove invalid items" to clear any info folders with missing original files.
Reload library: Select "Reload library" (ensure your sync tool has completed synchronization first).
Final repair: Select "Fix invalid items" to complete the process.

Important notes

If the original file is completely lost, it cannot be restored unless you have a previous backup
Always ensure synchronization is complete before attempting repairs
Regular backups of your Eagle library are recommended to prevent permanent data loss

Why can't I preview some images with double-click or load them in detail view?