Hello all -
The source of our problem was people skipping around the CloudFront cache. We blocked a number of those sources yesterday and just within the last hour another large group. Just now I fully patched the game from Dublin (via a VM) and didn't have any errors. In spite of that, there are 240 edge nodes around the world, and the one you connect to might still have some bad files, so please if you get blocked, send your gw2.log file to our CS people so we can stomp out the bad files. Anytime we invalidate a file it gets invalidated for everyone. (The terminology is odd - invalidating a bad file in this case is a good thing. The reason we don't invalidate all 670,000 files is that it would stress out our origins.)
Thanks.