Just a quick update, tried a few options and managed to simplify several of the problem pdfs, of course they still either don't work or are painfully slow so I'm reluctantly coming to the conlusion that the Dr1000s is just not up to the task of handling anything but text on a plain background and the very simplest of pictures / diagrams
Ah well, seems I'm going to be waiting a few more years for eInk technologies to catch up with the fancy layouts of pdf RPGs.
Thanks for the advice though, at least I now know I've tried.
Vadrus