Thanks for the suggestion, Rubén, I hadn't thought about testing that one. Sadly, that doesn't work either. The book in question is
Wisting, Oscar: 16 ĺr med Roald Amundsen, by the way.
The 76% width limit does make it natural to think of the e-ink aspect ratio, but what kind of warped logic that dictates that 77%-100% == 100% I cannot begin to fathom.
KF8 has been a bitter disappointment to me; I thought it would be an improvement to Epub2, but there are so many spurious limitations, inconsistencies and apparent bugs that it falls greatly behind. Maybe there should be a stickie in this forum with "KF8 annoyances", similar to the "ADE bugs" stickie in the epub forum?