Hi,
Testing this a bit more locally with a single-site install and not seeing any errors with debug turned on (generating the following):
http://wpm.com/wp-content/cache/minify-d7ba1aa3d2a4c4f5d49ff36f69999227-1344439294.css
but the links themselves go to a 'Page not Found'
I have the following in my .htaccess file:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
RewriteRule ^wp-content/cache/minify-(.+)-(.*).(css|js)$ /wp-content/plugins/minify/make.php?hash=$1&type=$3&incr=$2 [L]
</IfModule>
# END WordPress
Not using Memcache at the moment (only other thing installed is the APC Object Cache). Any suggestions?