Library books are fulfilling but not appearing in ADE - any suggestions?

Thanks for trying, Mod, although it doesn't seem to have helped yet! 

Have now tried a variety of suggestions from around the forums.

If I uninstall and reinstall i can get the books to fulfil and appear in ADE but it completely freezes it. I then have to close it with Task Manager. When I reopen it, it's back to saying the books are being fulfilled but nothing appears.

I have tried every variation with authorisation and with the order in which I do things that I can possibly think of.

The first two books downloaded without issue.