I just installed Calibre for Windows 64-bit 5.15.0 in my new PC. I purchased Japanese Comics, fiction, and magazine book from Kobo Japan, downloaded them via Adobe Digital Edition, then import into Calibre.
Some of the imported books, such as fiction, can be displayed corectly by Calibre E-Viewer. But for Comics, the cover page can be displayed correctly, but the inside pages are displayed as a tiny icon only.
My old PC with older version of 32-bit Calibre did not have this problem. But unfortunately my old PC has bee scraped already.
e.g.
cover page :
inside page :
