Hmmm... I just noticed when I view source a couple of my ASP.NET projects that the style sheet links are repeated twice for the same CSS style in the html head.
Interestingly enough the tags look different:
Couldn't find anything with web searches - perhaps my Google CHI is a bit low today.
I only have one theme, and there is only one .CSS file in it. I don't reference the theme directly and use only the web.config to specify the page and stylesheet themes.
Any ideas?