Viewer not opening any ebooks

jenrar · 12-04-2025, 07:25 PM

Most of the time, my Viewer won't open a book. First open or not. Occasionally it works fine for a whole session of me opening books (to verify name on cover, read, whatever). But then I go for a while and it doesn't work. Opening it just sits there and "spins" (ie loads).

I've done searches here. I know that it might be a cache problem. But I am absolutely clueless about how to do the suggested move of the cache if that's what's needed.

theducks · 12-04-2025, 07:29 PM

Most common is the Graphics driver on the PC is old. Try for an updated driver.

(I have one that is so ancient and no updates. Last Calibre VIEWER that worked was 7.16. Main Calibre did still function)

jenrar · 12-04-2025, 07:32 PM

Okay, I just tried updating but it says I have the latest updates. All my PC updates are up-to-date, including the graphics driver.

Quote:

Originally Posted by theducks

Most common is the Graphics driver on the PC is old. Try for an updated driver.

(I have one that is so ancient and no updates. Last Calibre VIEWER that worked was 7.16. Main Calibre did still function)

jenrar · 12-07-2025, 05:26 PM

So no one else having that issue or thoughts on it?

kovidgoyal · 12-07-2025, 10:09 PM

First, try rebooting in safe mode and see if it works.

jenrar · 12-07-2025, 11:29 PM

That worked! Yay. Even better, rebooted in regular mode, and they open perfectly, even ones I haven't opened before. Double yay!

But...what does that mean? LOL

At least now I know what to do if it happens again.

Thanks, kovidgoyal!

Quote:

Originally Posted by kovidgoyal

First, try rebooting in safe mode and see if it works.

kovidgoyal · Yesterday, 12:46 AM

It means there is some software on your computer that is interfering with calibre, typical culprits are anti virus or file sync programs.

jenrar · Yesterday, 01:03 AM

Hmm. Okay. Thank you.

Quote:

Originally Posted by kovidgoyal

It means there is some software on your computer that is interfering with calibre, typical culprits are anti virus or file sync programs.

12-04-2025, 07:25 PM	#1
jenrar Connoisseur Posts: 71 Karma: 10 Join Date: Nov 2011 Device: none	Viewer not opening any ebooks Most of the time, my Viewer won't open a book. First open or not. Occasionally it works fine for a whole session of me opening books (to verify name on cover, read, whatever). But then I go for a while and it doesn't work. Opening it just sits there and "spins" (ie loads). I've done searches here. I know that it might be a cache problem. But I am absolutely clueless about how to do the suggested move of the cache if that's what's needed.

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12-04-2025, 07:29 PM	#2
theducks Well trained by Cats Posts: 31,343 Karma: 62025226 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Most common is the Graphics driver on the PC is old. Try for an updated driver. (I have one that is so ancient and no updates. Last Calibre VIEWER that worked was 7.16. Main Calibre did still function)

12-07-2025, 05:26 PM	#4
jenrar Connoisseur Posts: 71 Karma: 10 Join Date: Nov 2011 Device: none	So no one else having that issue or thoughts on it?

12-07-2025, 10:09 PM	#5
kovidgoyal creator of calibre Posts: 45,697 Karma: 28549304 Join Date: Oct 2006 Location: Mumbai, India Device: Various	First, try rebooting in safe mode and see if it works.

Yesterday, 12:46 AM	#7
kovidgoyal creator of calibre Posts: 45,697 Karma: 28549304 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It means there is some software on your computer that is interfering with calibre, typical culprits are anti virus or file sync programs.