Hi all,
We are currently not too sure why this is happening again, and are unable to reproduce it.
We had this issue a long while back, and it was due to the extension sending an Authorization header to summarizer (and due to the way it's hosted, it doesn't like this).
After finding that out, we released an update (0.7.3.1, in November) to change this so it no longer happens (we don't use Authorization at all anymore).
But from the info provided, it seems like your extensions are still sending the Authorization header for some reason.
For anyone having issues, if you re-install the extension fully (completely remove it and install it again) - does the issue persist?
We'll continue to investigate and see if we can figure out what is going on.