Possibly related (but this is Windows 10/11 Calibre Portable x64, Qt6 version 6.3.1)...
Once I upgraded to the 6.x version of Calibre, the epub Viewer gets stuck at varying places. Both 6.0 and 6.1 do this. It's not specific to any epubs (I've tried known working, and new/first opens). The viewer FREEZES at any time while viewing or trying to open: at the "Loading book, please wait," or while reading the book changing the page, or even just going to highlight a sentence and suddenly nothing is responsive but the Exit button to close the application. For the same epub, it FREEZES in different points (on open, page change, highlight, etc.) each time you open it, so there is no specific "spot" the viewer is hitting.
I've uninstalled reinstalled, same problem. I'm thinking this is related, but if not, I'll create a new thread.
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