i already have PRS+ as for "It is strange that ï gave you a question mark" - I often find that I can replace a dodgy character with a 4 digit alt code, which looks identical, and the replacement will work fine.
There must be more than one way to create those special characters, and ade/sony is less tolerant that sigil book mode / calibre viewer
I am also guess that Sony use their non-serif font for menus & for pages such as list notes, so that when a short text extract appears on the list page, it is not in same font as when it is in the book ?
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