Synchronization does not seem to work. I was reading on my tablet and my battery was low and I wanted to keep reading on the computer. I logged in with the same account on the server that I set the local viewer to sync with. At first I thought it was not working because I got a message that something is happening but nothing happened and thought that I had lost the connection and restarted Firefox and logged in again. After restarting, pressing Sync in the controls did seem to work, because no message appeared this time, but when I opened the book on the computer, it still opened at the beginning of the book.
I've tried Chrome and use https but I still can't get it to work.