I've experimenting with W3TC's CSS minifying, and found what I believe might be a bug.
Basically, I all of my theme CSS files in W3TC's CSS box (using the test button to make sure they work), save the changes, load the page, and most of the styling has disappear. Then I look at the source code, find the combined/minified CSS link, manually open it, and see that it doesn't include all of the original CSS files' code, with only the first two or three CSS files being actually combined and the contents of the later ones disappearing.
I could just remove the CSS files whose content isn't included, but since the first few CSS files are small, and the bulk of the styling is in the latter ones, the real advantage of minifying disappears.
Is there some way I can help debug what might be causing the last few CSS files' contents to not get included in the combined minified file?