Board Thread:Support Requests - Getting Technical/@comment-7726294-20130510030206/@comment-10688548-20130510032034

It's quite possible that it's a problem with your CSS. Running it through w3c's CSS validation service gives a whole host of errors: take a look at the results here.

Just because something is an error doesn't mean that it will break your CSS (w3c is very picky about standards compliance). But you might use that to troubleshoot your code.