We have a company website built on a DNN platform. Few months back, our main skin.css (that lives under Portals/_default/Skins/Theme/skin.css) file that was linked from all .ascx files stopped working. When we update skin.css file it doesn't affect the styles at all. When i try adding newskin.css file to .ascx file, it does work. But for some reason main skin.css file that has all the styles does not work when we update existing styles on that file. when i inspect the element in the browser, i see this OURDOMAINNAME/DependencyHandler.axd/d7fd8b654ff3306fc7eafb8efb2c8805.135.css