Quote:
Originally Posted by Jack Knight
Thank you for your answer, theducks ! What I understood from it, because I'm a total noob in epub structure, led me to a possible solution.
So I...
- Opened the epub in Sigil.
- Removed the 'cover' status (semantic ?) of both the first html file and the image included in the epub.
- Renamed the image cover2 and changed the appropriate file name in the first html file. Was it necessary ?
- Used the 'add a cover' option.
I was having serious brain farts with the way calibre handles things and also had trouble with the fake blank cover reappearing upon an epub to epub conversion. While similar, Sigil creates an html file when adding a cover, which avoided dealing with temp file.
Would it be considered a good way of solving the matter ? Maybe more importantly, I hope I make a minimum of sense 
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EPUB does not care what the names of the cover files are.
It is all about Location (first in the (Sigil text section) list) and semantics.
The 'cover' tool takes care of the semantics and
makes a brand new file which is why the cover
previous semantics must be cleared or those will be replaced (those old files become just
another file in the book).

Why are you doing a EPUB -> EPUB after you did a cover change out? The whole purpose of this method was to avoid a same type conversion with associated side effects.