1. Not had a not working 'complex' Mobi experience yet - but i clock the advice
convert Mobi to epub. and reconvert broken epubs to epubs.
2. Just going through the epubs currently on my device - i am seeing that they
are working with the % read - - though not sure yet how accurate that is - you're right
it's the mobi which is the issue.
Just one last thing i noticed, slightly off topic; on some of my epubs - the page refresh is happening every page for a couple of them when the reader setting is set to 'refresh every chapter' - is that a format tweak i can correct in calibre or somewhere ? Seems like the formatting has indicated every page as a chapter or something ... would i find a thread in these forums to a definitive guide to best settings when making epub files using calibre or whatever - again a newbie to this activity also.
That last query should complete this enquiry.
Thanks everybody - great forum .
sp