This new update fixes quite a few problems that users have been reporting. There was a bug which downloaded posts saved as drafts and displayed them as normal posts. And for some, these drafts were shown as drafts, but when you open the post to view, it displayed "null" in the Reader.
This has been fixed now. For now, your drafts will still be downloaded and will be shown as drafts, but you cannot open these posts. When you go to blogger and finally publish this draft, and come back and refresh the list, then you will be able to view the posts.
Do let us know your feedback and issues if any.