Hi tollmanz,
1. 3.2.1
2. https://example.com/wp-admin/edit.php, you get to view all your posts here, and you can do a [Quick Edit] on each of them on the same page
3. post and custom post type, not sure about page as I didn’t check.
My guess it could be php error reporting settings on my host, not really sure though.
Anyway, I use your fixed version and the error is gone now. So yes, you can proceed with the official update for your awesome plugin.
Thanks!