I managed it in the end. I figured out not only what the problem was, but why I had a problem with that frame in particular. The frame uses a particular opcode, 0x60, a lot, when others don’t (at all? Not sure). That opcode gives very precise control over the image: where the previous frames have been slightly “rushed” as it were, to save space, this one is done very precisely. If you remember the intro to 7th guest, you’ll know why: all the action for the next few scenes takes place on the pages of that book: it basically doesn’t change for a minute or more.
But that’s not important. The important thing is that it works. Now I’ve just got to try it on all the others and find the ones it doesn’t work on…