Did you ever find a solution? In our tests, we haven't be able to make isVisible return true either. Not sure if it's not working or if there's a problem in our understanding on how it's supposed to work.

I received 2 e-mails today. One earlier today in an account that hasn't really been active since 2014 or so, which had me scratching my had for a bit earlier today, and one just now, on our actual dev account, which has us pretty worried. So the error is still happening it seems. If this e-mail was sent in error, can you send a follow up e-mail about it being an error or something? Also can you stop the error? It seems to me e-mails are still being sent out.

Yup, same here, I'm guessing it is some problem related to the connect website than some problem with our installations of Xcode + SDK

I tried deleting all the SDKs and re-downloading them, no change, still can't submit for review.