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Old 03-21-2026, 02:08 AM   #31
Comfy.n
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awesome!
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Old 04-01-2026, 11:44 AM   #32
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I only realised this was happening when I tried to install 9.6.0 from the version I updated to a couple of days ago.

It's still happening for me in 9.6.0 on Windows.

On Linux, it seems to exit cleanly.
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Old 04-01-2026, 11:52 AM   #33
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FWIW, on Windows, I never saw that happen again since 9.5.101.
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Old 04-01-2026, 11:53 AM   #34
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Ah.... the install must have failed. On start up, it's 9.5.101. Let me try again!
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Old 04-01-2026, 12:00 PM   #35
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Unfortunately repair didn't work:

Click image for larger version Name: Calibre-9.6-hung.png Views: 32 Size: 6.4 KB ID: 222254

I'll try uninstall/reinstall.
Last edited by Comfy.n; 04-01-2026 at 12:17 PM. Reason: img too wide
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Old 04-01-2026, 12:07 PM   #36
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No, no difference after uninstall / reinstall.

This is what I see whilst it's running:



When I exit, one of the "calibre-parallel.exe" processes exits but the other stays, along with the main process.
Last edited by Comfy.n; 04-01-2026 at 12:14 PM. Reason: corrected truncated IMG inline attachment
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Old 04-01-2026, 12:29 PM   #37
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Quote:
Originally Posted by pljones View Post
No, no difference after uninstall / reinstall.

This is what I see whilst it's running:



When I exit, one of the "calibre-parallel.exe" processes exits but the other stays, along with the main process.
Are you sure you've not enabled the calibre systray icon? It could be actually running on your system tray.
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Old 04-01-2026, 02:13 PM   #38
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(on Windows) I had a long running instance of calibre (since 9.6 update) and it seemed to be running slowly. After quitting it would not start up (don't remember error box).

Task Manager showed 'calibre worker process' still running. Killed that, and calibre started up and running normally.
Last edited by tomsem; 04-01-2026 at 02:15 PM.
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Old 04-13-2026, 12:59 AM   #39
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I had this same problem after upgrading from 8 to 9, 9 would not close, but it has been resolved as follows..

The root problem was duplicated books in library, for some reason 8 has no problems and will open and close normally. But after upgrading Calibre 9 would hang when closing. In the end I found the duplicate problem by using the portable version and importing the existing library, during the import process Calibre reported duplicates. I removed the duplicates and version 9 now opens and closes normally.

Perhaps this points to a problem in version 9.
Last edited by cpcfreak; 04-13-2026 at 01:02 AM.
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Old 04-14-2026, 10:20 AM   #40
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Quote:
Originally Posted by tomsem View Post
(on Windows) I had a long running instance of calibre (since 9.6 update) and it seemed to be running slowly. After quitting it would not start up (don't remember error box).

Task Manager showed 'calibre worker process' still running. Killed that, and calibre started up and running normally.
Yesterday I tried to install latest calibre update (after closing running instance of calibre) and it failed. As in above case, I discovered worker processes still running. After killing them, install succeeded.
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