I have problem with setting up my test initially. The test page seems not working probably with my default website if theme is enabled. Is there any setting that I've missed?

I've solved the above problem with a little code change in top of TestDriverPage.GenerateInterface().

            HtmlLink styleSheetLink = (HtmlLink)_aspNetService.FindControl(this, "driverPageStyleSheet");
            styleSheetLink.Attributes.Add("href", Page.ClientScript.GetWebResourceUrl(typeof(Microsoft.Web.Testing.Light.Engine.TestDriverPage), "Microsoft.Web.Testing.Light.Engine.Resources.driver.css"));

Moreover, I've change the DriverPage.aspx like below.

<link id="driverPageStyleSheet" rel="stylesheet" type="text/css" media="screen" />

This seems working fine for me right now.

Interesting, so it doesn't work if the link is written out in the page, but it works if you generate the href programmatically. Bizarre.

Thanks for reporting this, I am glad you found a work around... I'll look into this next week.

- Federico