I am quite new with Rails and I am having some irritating problems with caching of css files.

I have a .css.less file with imports inside it. It's the only stylesheet the app includes, so the other files get imported only once and by this unique stylesheet.
One of those imported .css.less stylesheets seems to be cached somewhere, because does not change in the browser when I change it's source. 

I can only see the changes I made if I change something in the root stylesheet.

I have the server in development mode, so the caching should be off. I have also used `<%= stylesheet_include_tag "style", :cache => false %>`

I tried with Chrome and Firefox, with and without clearing their cache too. Always the same result, if I work only on that file the css the page receives when reloaded doesn't have the changes...

I also stopped the server and rm everything in the tmp folder of the app. No changes.

I am using Rails 3.1 with Ruby 1.9.3, with the less-bootstrap-rails gem. Both the root stylesheet and the imported one have .css.less extension.

What am I missing?

Thank you!