Kovid - thanks for the reply, much appreciated. I'm not sure how to use the code snippet you provided though - where can I access the value of 'html'?
And I'm not convinced it's a login question - I thought perhaps something to do with the user agent? You can access the articles it failed to whether logged in or not.
I posted this as a new thread, with the specific problem. Perhaps you might have a chanc to take a look at the error message?
https://www.mobileread.com/forums/sho...d.php?t=161669
Thanks again