I wrote a post last night and went to schedule it for 10:28 this morning. When I got home at 11:00 the post had not published.
My first thought was during the dashboard makeover my london time setting had been over ridden, it had been so I changed the post for 11:18 scheduled post and changed my timezone.
At 11:55 it still hadn't posted. So I decided to set it for 10:57 (which by UTC (server) time was a few minutes away.
That however was taken as in the past and the post was published immediately.
I am on wordpress.com using the Koi template and 12 widgets (most just image or html.) I had no trouble scheduling before the wordpress upgrade.
I also noted while trying to get my post live that it isn't possible to change the status from scheduled to published. (Which would have been easier for me trying to publish my post when it originally didn't post and I had to try and figure out what time it was.)
The blog I need help with is scarletleonard.wordpress.com.