I now have WordPress 3.4 in Multisite mode. Most of W3TC works fine, but I've recently noticed that it's not minifying my CSS, it's only combining the files.
My CSS still gets the line numbers in comments, and there is no line-break removal or any sign of minification. I can change the settings around, refresh, and see no change.
This happens with the default CSS minify as well as CSS Tidy.
Is anyone else having this?