ASP .NET - asp:Menu based on sitemap does not work in IE7?

I have a asp:Menu bound to a Sitemap on my sites master page:

<asp:Menu ID="Menu1" runat="server" 
     DataSourceID="SiteMapDataSource2" 
     Orientation="Horizontal" 
     StaticDisplayLevels="2" 
     CssSelectorClass="PrettyMenu">
</asp:Menu>

The menu works really well on my development box with Firefox 3.5. When I try to run the site within IE7 the menu does not respond at all.

Is there something related to the menu code that would cause this?

UPDATE2:

The issue appears to be related to the CSS Friendly Controls Adaptor. Firefox is responsive but IE7 only shows the top tier of th开发者_开发知识库e menu and doesn't respond at all.

I had a similar problem with IIS 6.0 and IE8. The following Microsoft KB article talks about it. Don't know it applies in your case though:

http://support.microsoft.com/?scid=kb%3Ben-us%3B969612&x=5&y=10

In case anyone else encounters something similar:

I had to remove the CSS Friendly (browser) files from the project and all the menu issues went away.

I had similar problem, editing CSSFriendlyAdapters.Browser (located in App_Browsers folder )solved my problem. It was like this, you should remove some elements:

<browsers>
  <browser refID="Default">
    <controlAdapters>
      <adapter controlType="System.Web.UI.WebControls.Menu"
               adapterType="CSSFriendly.MenuAdapter" />
    </controlAdapters>
  </browser>

  <browser id="W3C_Validator" parentID="default">
    <identification>
      <userAgent match="^W3C_Validator" />
    </identification>
    <capabilities>
      <capability name="browser"              value="W3C Validator" />
      <capability name="ecmaScriptVersion"    value="1.2" />
      <capability name="javascript"           value="true" />
      <capability name="supportsCss"          value="true" />
      <capability name="supportsCallback"     value="true" />
      <capability name="tables"               value="true" />
      <capability name="tagWriter"            value="System.Web.UI.HtmlTextWriter" />
      <capability name="w3cdomversion"        value="1.0" />
    </capabilities>
  </browser>
</browsers>