Quote:
Originally Posted by DrChiper
I went back to FW 4.14.12777 because suddenly all marking ceased to work (you can mark a word, it is indicated, but its not on the notes page) and the last reading location is not remembered anymore, so the reader returned from the notes page to the very first book page. No clue why.
Reverting to the previous FW did solve all that and marking is working again.
Go figure 
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That is usually a sign that the database has become corrupted. If that was the case, then going back to an older firmware version won't fix it. If it is happening for all books, this is probably the case.
If it is just one book, can be an error in that book.
It can also happen if you edit a book and restructure the internal files or rebuild the ToC and then replace the book without removing it first. The stored version of the ToC doesn't match the book and the navigation doesn't work. That can also cause some problems with annotations.
The last reason I can think of is if an epub has been sideloaded as a kepub without the extra spans being added. But, the last time I tried that, the book reopened at the start of the chapter you were up to.