I typically read on 3 devices - Voyage, iPad, and iPhone. Sync has functioned flawlessly with both books and personal documents. Yesterday, I opened a personal doc on my Voyage that I had been reading on my iPhone earlier in the day. Upon opening, I did not get a prompt to sync to the furthest page read automatically (it usually would give me a popup asking if I wanted to go to the furthest location). When I opened up the menu to manually sync, the "Sync to Furthest Page Read" option immediately grays out and cannot be selected.
I have tried everything I can think of - deleting the doc from Amazon and reuploading, fully resetting and de/re-registering both devices, turning sync on and off on both devices and on Amazon - but it is still not working. It was functioning with this exact same document on both devices several days ago, which makes this all the odder. Also, sync appears to be functioning with all other books and documents - just not this one any longer.
I have a voyage and iphone with the kindle app - i just use it for books. It's always worked flawlessly. and in the past 2 days the "sync to furthest read page is no longer working. at all. i've tried to restart both my kindle and my phone. niether helps.