Impossible to launch Calibre.

[JULIUSGT]

Hi
I have been using calibre for several years on Windows 10.
For about 15 days Calibre no longer wants to launch.
I have reinstalled several times by deleting all files, dll, registry keys, etc.
With versions 7.20 or 7.21.
I tried with Calibre portable impossible to launch Calibre.
The "calibre-debug -g" allows from time to time an opening of a few seconds.
Launches once with calibre-debug -g with the administrator command prompt, then closes without comment.
Who can provide a solution to this problem.
Attached file the results of "calibre-debug -g"
Thanks.

[Comfy.n]

Hi,

Looking at your debug log, the only odd thing I notice is the line:

Failed to read metadata from font file: c:\windows\fonts\photse__.ttf unpack requires a buffer of 18 bytes

Did you try Windows safe mode, to see if it runs without other programs interfering?
https://www.wikihow.com/Start-Windows-in-Safe-Mode

FYI, a search for that ttf file returned a malware analysis page:
https://www.hybrid-analysis.com/samp...ironmentId=100

[JULIUSGT]

Hello.
Thank you for your reply.
Calibre launches in safe mode.
But does not launch in normal mode.
I have done a malware scan with malewarebytes and with Microsoft MSRT in safe mode.
Windows Defender has been installed on the computer for a long time.
The computer is up to date. I have deleted the "Photoscore.ttf font".
I have uninstalled and reinstalled Calibre 64bit-7.21.0 but no improvement.
The "calibre-debug -g" does not indicate anything new.
Microsoft Windows [version 10.0.19045.4894]
(c) Microsoft Corporation. Tous droits réservés.
C:\WINDOWS\system32>calibre-debug -g
calibre 7.21 embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.11.5
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: fr
EXE path: H:\Program Files\Calibre2\calibre-debug.exe
C:\WINDOWS\system32>
Thank you for your help.

[BetterRed]

Does calibre start if you Run it as administrator?

If it does see : https://www.mobileread.com/forums/sh...6&postcount=13

BR

[JULIUSGT]

Calibre does not launch with administrator run.

[fireffox]

I have the same problem. I think there is a conflict between Calibre and display graphic card driver. Nobody has a solution for now...

[theducks]

Originally Posted by fireffox

I have the same problem. I think there is a conflict between Calibre and display graphic card driver. Nobody has a solution for now...

What Card? (so folk know)
I have issues with ONLY the viewer with an old radeon card. The Main Calibre launches

[fireffox]

Mine is GeForce GTX960. Drivers updated. I've noticed that during drivers reinstallation, in that moment between old and new driver, I can open Calibre. After installation I can't.

[JSWolf]

Originally Posted by fireffox

Mine is GeForce GTX960. Drivers updated. I've noticed that during drivers reinstallation, in that moment between old and new driver, I can open Calibre. After installation I can't.

If you are on a laptop with dual video, have calibre start using the other video chipset.

If the first suggestion is no good, try adding the following environment variable.

QTWEBENGINE_CHROMIUM_FLAGS="--disable-gpu"

That will disable the video card for calibre and hopefully allow it to work.

[fireffox]

I've tried that. Not working. Only safe mode works...

[BetterRed]

I've had a GeForce GTX1060 since 2017, works fine, using the drivers it shipped with. I'm a firm believer in the "If It Ain't…" maxim when it comes to hardware drivers… especially video adapter drivers.

BR

[fireffox]

Originally Posted by BetterRed

I've had a GeForce GTX1060 since 2017, works fine, using the drivers it shipped with. I'm a firm believer in the "If It Ain't…" maxim when it comes to hardware drivers… especially video adapter drivers.

BR

Yes, but when occurs any problem everyone says: "update drivers"... I have to try with previous drivers.

[BetterRed]

Originally Posted by fireffox

Yes, but when occurs any problem everyone says: "update drivers"... I have to try with previous drivers.

I try to make a point of not being 'everyone'

BR

[fireffox]

It works with old version of Nvidia drivers!!! :-)

[BetterRed]

Another win for the antiestablishmentarians

BR