Hello Rakel-
I’m very sorry to hear about the problems using W3 Total Cache.
It’s tough to speculate what might be going on without a little more information. Can you describe what doesn’t work when W3 Total Cache is enabled? Do you see errors in your browser’s error console, or from your WordPress debug log?
Here are instructions on how to enable the WordPress Debug log, as well as a quick video tutorial on how to use your browser’s error console.
I took a look at the website you sent over privately, and it looks like you may already be using another solution for minification of your website. If that’s the case, make sure that you’re not also enabling minification in W3 Total Cache. Minifying with two different plugins is one of the most common causes for errors when using W3 Total Cache.