What does the red exclamation mark next to English (language dropdown) mean in iTunes Connect?

Question

I'm getting the generic "There are one or more errors on the page" error when I try to update the build number for the pre-release version of my app. I have done an exhaustive review of every tab, localization, setting, and form factor and I can only find one item marked as problematic.

On the Versions tab I see this for my currently-shipping version of the app:

When I open the dropdown and scroll to the bottom, I see this:

I can't find anything else marked as a problem, and when I select the red exclamation mark in the drop down, the page reloads, but nothing changes and nothing is obviously broken.

I also note that on the pre-release version of my app, I have a blank entry in the localization list:

Attempts to remove the blank line reveal it to be Flemish. It also solves the problem—I can save the changes after I remove it. However, once I click save, leave iTunes Connect, and return, the build number has reverted and Ghost Flemish has returned, and so has the error.

(Per other questions / answers I did make sure the price is set and all fields have been filled out correctly.)

Answer 1

With the new capability to have just one set of screenshots, go to where you add screenshots and click on Media Manager. Once there, for all the other iPhone sizes, check the "Use 5.5-Inch Display".

Answer 2

Apple has confirmed this is a bug with iTunes Connect and you have to contact developer support to get it resolved. I have successfully done this.