Very peculiar...
I had the same problem, however the above fix did not fix it. I had to
do this:
#php_value zlib.output_compression 16384
#php_value zlib.output_compression_level 4
However, this means that I now have the opposite of the intended config
(no compression, but
Oh wait, I got it!
I edited the /var/www/mythweb/.htaccess file (has the same config
lines). I had to make the change in /etc/apache2/sites-
available/mythweb.conf and restart apache. All good now.
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Cannot use both zlib.output_compression and output_handler together!!