Yes, the new format might be miles better but the new behaviour of the "back" button is frustrating.
If you are scanning a few pages deep in a non-default section and hit the "back" button, the cursor returns to article 1 of the first (default) section and you have to start your scan all over again.
Like a previous poster I tried sending instapaper articles directly from the instapaper website (not calibre) and the "back" button remembered the location of the cursor (the same as the original behavior).
So is this new behaviour of the "back" button only related to Calibre periodicals?
Has anyone tried the behaviour with paid amazon subscriptions?