Clicking View Post On Drafts Opens A New Tab

What happens to me in 4.2.2 is the first time I hit Save Draft the page refreshes to a New Post screen. I was less than happy that my initial edits got wiped, but checking the Edit Posts page I found that the Draft had been saved and closed; replaced by a New Post. Opening the saved post, performing edits and hitting Save Draft from then on works as expected. This happens with three different themes running on different sites in a Multisite Sub-domain install. I have since ensured that this doesn’t do any more damage than described above by Selecting All and Copying to clipboard before hitting the button.

I have some time now, so will slog through the tedious process of disabling plugins to see if one has an issue with v4.x.x

Ok. Jumping through the deactivate plugins hoop, and deactivating all of the site-specific plugins on one domain, nothing changed. I then turned to Network Activated plugins. I got to Jetpack and first decided to deactivate modules within it first, as opposed to the whole plugin. That this issue is related to posts, I deactivated Shortcode Embeds and WP.me Shortlinks. Problem went away!

To narrow down to which one, reactivated Shortcodes. Still no problem. Deactivated Shortcodes and reactivated Shortlinks. Still no problem. Reactivated Shortlinks. Still no problem. Huh?

I’m back to where I started and the first Save Draft now returns to Edit Post; not New Post. Go figure. Might be that Jetpack config needed a kick.