Thanks guys,
Fully confirmed. Kobo Utilities has nothing to do with it. If I delete the book, I do a turn on/off cycle and I reload the book with the new cover it is perfectly updated...
I was looking for the complicated explanation (something weird in Kobo Utilities) and, as always, the solution is the simplest and dumbest one:
And yet another bug in Kobo! (Why the hell do you keep in memory anything about something that does not exist? More over when, in fact, you have already decided it is useless because if you perform a turn on/off cycle you do not store it in your permanent memory, database or whatever...)
There's an idiom in Spanish, (I suppose in English too), which, literally translated, is more or less: The ways of Lord are inscrutable... And it doesn't only have a religious meaning...
EDITED (TWICE)----
What follows is wrong. Period. But if I delete it you won't understand the next post by davidfor and my following one.
WTF! This is what also happens with annotations!
If you delete your current reading without deleting its annotations and you resend it again those annotations are also cached. But if you perform a turn on/off cycle in the middle they are lost!!!
@davidfor, sometime in the past, I pointed out that behaviour, (saving annotations of books that doesn't exist any more, which could be completely modified when you resend them -- in fact I use annotations/highlights in order to mark the typos I find in the books...), as some kind of bug. And you answered me they could be somehow something GOOD, that some people actually preferred that behaviour. Then if you, (Kobo, I mean), have decided they are good, (a decision I do not agree with, but a decision I could understand), WHY do you throw them away with a turn on/off cycle?
More over, I suppose the memory of the device is limited, so, how many annotations, covers, whatever, do you "temporally" store? Do you only do this for the current reading?, for the last 3 deletions?, till that "caching memory" (whichever it is) is full?, till when?
Then, if the book has not been loaded/opened for a very long time, so the annotations are not in your memory when it is deleted, do you force their loading in order to do this absurd "temporal" storage? Or don't you?
Am I the only one seeing a completely absurd incoherency in the design here? Either you store information or you don't, but playing something in the middle with no clear criteria...