This just hit me, remoting in to a client who was remoting in to an end user, setting up a web application I wrote. It’s an ASP.NET 2.0 application and uses the CSS Friendly Adapters to produce cleaner HTML, but it appeared those adapters weren’t working, first noticed by the menu not rendering. Or rather it was rendering, but the CSS wasn’t being applied so you couldn’t see it. Inspecting the page load showed the CSS files were being loaded, but somehow not being applied. A quick search came up with a solution, which is to remove the compiled browser capabilities file and everything appears correctly.