A few people have reported that when they download a .tar.gz file from acme.com, their browser "helpfully" gunzips it but leaves the filename the same. So they have a .tar.gz file that is not gzipped, which is confusing and annoying. My own browser does not do this, yet, but perhaps it will the next time I update it.
As an experiment, I have changed acme's web servers to not send the Content-Encoding HTTP header at all. If this fixes the issue, and doesn't cause other problems, I'll put out a release of the servers.