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Thank you for having a look, I appreciate it.
This happened when I updated the kernel/ qt / others, the video drivers were not updated... although I understand that on an old video card (it's an ati radeon E350 system) some deprecation might have weird side-effects.
Is it possible that there is a mismatch of api/code interface between the calibre provided qt libs /opt/calibre/lib/libQt5* and the system ones in /usr/lib64/qt5/* or something like that?
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