Hello,
Thanks for the bug report, but I wasn’t able to reproduce this issue.
I went to the calendar and created a new draft post on a specific day. I gave the post a title and a couple of words in the body. Then I saved the post and pressed the Quick Edit link for the post. When the dialog popped up I editing the post content and saved it. The save did work and I was able to see it in the Quick Edit dialog in the calendar and the WordPress post edit page.
I repeated these steps for a post in the unscheduled drafts section and it worked there too.
Can you please try this on our test blog:
http://www.zackgrossbart.com/extras/sandbox/wp-admin/edit.php?page=cal
If the problem happens there can you please give me the specific steps to reproduce the issue and any errors you saw. I want to make sure I didn’t miss anything.
Thanks,
Zack