I also had a case open for this and was excited when I received a response yesterday, only to find this:
The dev team is indicating that this appears to be a network issue on your end.
Also, 6.3.1 is now available. I would recommend upgrading.
I am awaiting for requested information related to what brought them to this conclusion and if this is what they are going to tell the rest of the customers waiting on a fix. BTW, I did upgrade with no change...surprise.
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