I checked through my Android phone which in Essene is the same operating system.
I realised there were options checked that shouldn't have been so make sure the following is unchecked. This also solves the posting issue on Facebook an twitter apps.
>don't keep activities. - unchecked this option.
>reboot your kobo arc.
The second problem was to do with a book I'd sent to my arc, removed the book an rebooted ereader problem solved.