Opening Edit Book hangs freezes

[desertdaisy]

No matter which book I try to open using the Edit Book feature in Calibre 9, the process hangs with a new window that shows the book title and EPUB version, filename, and Edit book in the title bar of the new window but the rest of window remains blank. I can quit and it doesn't freeze, but it never loads the book or gives me an error message either.

Any suggestions for why this is happening or how to fix it?

[enuddleyarbl]

There are some interesting things to try here:

https://contentbase.com/blog/calibre...k-not-opening/

Down near the bottom, he summarizes things with:

7. Quick Fix Checklist

• Confirm that the selected record contains EPUB, AZW3, or KEPUB.
• If prompted, choose the correct editable format rather than PDF, MOBI, or DOCX.
• Convert an authorized unsupported source to EPUB or AZW3 before editing.
• Test Edit book with a small, known-good EPUB.
• Check whether the editor is open off-screen or on a disconnected monitor.
• Confirm that the library file and folder are writable and available locally.
• Pause cloud synchronization only long enough to perform a controlled local test.
• Review antivirus history instead of disabling security globally.
• Start calibre with calibre --ignore-plugins to test custom plugin conflicts.
• Use calibre-debug -g or calibre-debug --edit-book for focused diagnostics.
• Create a temporary library before reinstalling or altering the original library.
• Stop troubleshooting as soon as the editor opens and saves normally.

His instructions above that seem pretty detailed.