[Breezy]

Ah, for reference, this was the debug output:

Spoiler:

QPA platform: windows
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 54.504610226320196 x 108.85714285714285
ApplicationPaletteChange event ignored
Using calibre Qt style: True
ApplicationPaletteChange event received
[2620:16480:1230/175749.208:ERROR:cache_util_win.cc(20)] Unable to move the cache: Access is denied. (0x5)
[2620:17532:1230/175749.208:ERROR:cache_util_win.cc(20)] Unable to move the cache: Access is denied. (0x5)
[2620:2948:1230/175749.220:ERROR:disk_cache.cc(205)] Unable to create cache
[2620:2948:1230/175749.220:ERROR:gpu_disk_cache.cc(673)] Gpu Cache Creation failed: -2
[2620:2948:1230/175749.220:ERROR:disk_cache.cc(205)] Unable to create cache
[2620:2948:1230/175749.220:ERROR:gpu_disk_cache.cc(673)] Gpu Cache Creation failed: -2
[1.281] bridge ready
[1.360] iframe ready
stdout+stderr from file dialog helper: [b'', b'']
piped data from file dialog helper: [b'\x18P(\xe3\x15\xc9\x13\xd8}\xfe\xb2z"\xf9/\xe2\x18+\xea\xe7\xdbO\xb5\x8f&\x1c\x9f\x88\x8b\xb 4\x17\x82', b'C:\\Users\\Isaak\\Documents\\Ebooks\\Drugstore in Another World\\Drugstore in Another World - The Slow Life of a Cheat Pharmacist volume 2.epub']
[0.000] Load of book started
[1.641] prepared emitted
[1.656] webview loading requested
[1.719] loading finished