Aggregating CSS breaks with Internet Explorer Selecting the option to aggregate and compress css files breaks display in internet explorer 11. It displays fine with other browsers, or fine in ie11 if I deselect that option. The site in question is wowforfun.org

Thanks in advance.

Edit: Here's a part of the css as served to ie:

‹      µYér¤8þ?OÁŽ£#Ú³M•¶!öÇ>Á>ƒ
T 1 F»Üï¾™:@ªÚîÙí—Ë:Ryç§Ô
é%ÏxÝVTÒáÈENE²oÏAÇ+–§ü•ŠSÅß’’å9mÒ–wL2Þ$äzIÓ!krzNöq&lt;Þ¸Ä‚¾*ÖÉ°“ïMÞÐtþ;d5)ÌhMDÁš$N[’ç¬)ŸRÅ†#É^

Looks like it wasn't uncompressed at all.

Edit 2:

My .htaccess section related to compression:

&lt;IfModule mod_headers.c&gt;
# Serve gzip compressed CSS files if they exist and the client accepts gzip.
RewriteCond %{HTTP:Accept-encoding} gzip
RewriteCond %{REQUEST_FILENAME}\.gz -s
RewriteRule ^(.*)\.css $1\.css\.gz [QSA]

# Serve gzip compressed JS files if they exist and the client accepts gzip.
RewriteCond %{HTTP:Accept-encoding} gzip
RewriteCond %{REQUEST_FILENAME}\.gz -s
RewriteRule ^(.*)\.js $1\.js\.gz [QSA]

# Serve correct content types, and prevent mod_deflate double gzip.
RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]


&lt;FilesMatch "(\.js\.gz|\.css\.gz)$"&gt;
  # Serve correct encoding type.
  Header set Content-Encoding gzip
  # Force proxies to cache gzipped &amp; non-gzipped css/js files separately.
  Header append Vary Accept-Encoding
&lt;/FilesMatch&gt;


And here's the settings.php section:

# $conf['css_gzip_compression'] = FALSE;
# $conf['js_gzip_compression'] = FALSE;


I've tried those two lines both commented and uncommented, didn't make a difference.
The Advanced CSS/JS Aggregation Module might make it work correctly. If not, the advagg validator sub module might help identify the CSS that is breaking in IE.