Please can you add, fix or restore the autosaving capability within the editor in 4.5? I'm sure we used to have this. I just spent an hour editing and creating new content inside a custom Pages block within the AdminCP and when I clicked Save and Reload it asked me to log in, then my new content was gone, back to the old content. Aaargh!

Its never saved content in the ACP. The front end it saves it through the browser cache.