Originally Posted by meme
The height stretching is odd. Not sure how it looked before, but if it has changed then its another bug from Qt5. Win some, lose some...
Turns out this was happening in one book I was working on, but not another; I took a closer look, and the images that were acting as they should had a CSS style of "max-width: 100%; max-height: 100%;". Dropped that into the book with stretching issues and it was all sorted out.