W3 Total Cache CSS not updating

I can’t seem to make any changes to my CSS now that W3 Total Cache is running. I’ve tried emptying the page cache, the minify cache, all caches, my browser cache, but still my CSS files aren’t updating. Finally broke down and disabled minify all together, but still no luck. Not using a CDN, so that’s disabled. Any thoughts on how I can get back to being able to update my CSS? The site is http://vtdigger.org